diff --git a/src/_cffi_src/commoncrypto/cf.py b/src/_cffi_src/commoncrypto/cf.py
index 77d2d7c..9d4387e 100644
--- a/src/_cffi_src/commoncrypto/cf.py
+++ b/src/_cffi_src/commoncrypto/cf.py
@@ -101,5 +101,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/common_cryptor.py b/src/_cffi_src/commoncrypto/common_cryptor.py
index fc6eef9..15c253e 100644
--- a/src/_cffi_src/commoncrypto/common_cryptor.py
+++ b/src/_cffi_src/commoncrypto/common_cryptor.py
@@ -97,5 +97,3 @@
     kCCModeGCM = 11
 };
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/common_digest.py b/src/_cffi_src/commoncrypto/common_digest.py
index a76fc50..e40e729 100644
--- a/src/_cffi_src/commoncrypto/common_digest.py
+++ b/src/_cffi_src/commoncrypto/common_digest.py
@@ -56,5 +56,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/common_hmac.py b/src/_cffi_src/commoncrypto/common_hmac.py
index fcd0c0f..721cff5 100644
--- a/src/_cffi_src/commoncrypto/common_hmac.py
+++ b/src/_cffi_src/commoncrypto/common_hmac.py
@@ -35,5 +35,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/common_key_derivation.py b/src/_cffi_src/commoncrypto/common_key_derivation.py
index 1952585..13ae580 100644
--- a/src/_cffi_src/commoncrypto/common_key_derivation.py
+++ b/src/_cffi_src/commoncrypto/common_key_derivation.py
@@ -37,5 +37,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/common_symmetric_key_wrap.py b/src/_cffi_src/commoncrypto/common_symmetric_key_wrap.py
index ea9e459..9c7d42f 100644
--- a/src/_cffi_src/commoncrypto/common_symmetric_key_wrap.py
+++ b/src/_cffi_src/commoncrypto/common_symmetric_key_wrap.py
@@ -33,5 +33,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/secimport.py b/src/_cffi_src/commoncrypto/secimport.py
index 41a799f..8165759 100644
--- a/src/_cffi_src/commoncrypto/secimport.py
+++ b/src/_cffi_src/commoncrypto/secimport.py
@@ -84,5 +84,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/secitem.py b/src/_cffi_src/commoncrypto/secitem.py
index dd25543..19bfe76 100644
--- a/src/_cffi_src/commoncrypto/secitem.py
+++ b/src/_cffi_src/commoncrypto/secitem.py
@@ -25,5 +25,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/seckey.py b/src/_cffi_src/commoncrypto/seckey.py
index 01d42e6..99fe61e 100644
--- a/src/_cffi_src/commoncrypto/seckey.py
+++ b/src/_cffi_src/commoncrypto/seckey.py
@@ -22,5 +22,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/seckeychain.py b/src/_cffi_src/commoncrypto/seckeychain.py
index 6a2cb4b..221a87c 100644
--- a/src/_cffi_src/commoncrypto/seckeychain.py
+++ b/src/_cffi_src/commoncrypto/seckeychain.py
@@ -23,5 +23,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/commoncrypto/sectransform.py b/src/_cffi_src/commoncrypto/sectransform.py
index bed9495..0403746 100644
--- a/src/_cffi_src/commoncrypto/sectransform.py
+++ b/src/_cffi_src/commoncrypto/sectransform.py
@@ -66,5 +66,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/aes.py b/src/_cffi_src/openssl/aes.py
index 15da9b6..8a5d047 100644
--- a/src/_cffi_src/openssl/aes.py
+++ b/src/_cffi_src/openssl/aes.py
@@ -52,10 +52,3 @@
 #endif
 
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_AES_WRAP": [
-        "AES_wrap_key",
-        "AES_unwrap_key",
-    ],
-}
diff --git a/src/_cffi_src/openssl/asn1.py b/src/_cffi_src/openssl/asn1.py
index 96eff7d..44e9de1 100644
--- a/src/_cffi_src/openssl/asn1.py
+++ b/src/_cffi_src/openssl/asn1.py
@@ -164,5 +164,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/bignum.py b/src/_cffi_src/openssl/bignum.py
index d974e04..843e511 100644
--- a/src/_cffi_src/openssl/bignum.py
+++ b/src/_cffi_src/openssl/bignum.py
@@ -101,5 +101,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/bio.py b/src/_cffi_src/openssl/bio.py
index 6cc1bcb..ac86683 100644
--- a/src/_cffi_src/openssl/bio.py
+++ b/src/_cffi_src/openssl/bio.py
@@ -168,5 +168,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/cmac.py b/src/_cffi_src/openssl/cmac.py
index c01a449..f4a3686 100644
--- a/src/_cffi_src/openssl/cmac.py
+++ b/src/_cffi_src/openssl/cmac.py
@@ -43,14 +43,3 @@
 static const long Cryptography_HAS_CMAC = 1;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_CMAC": [
-        "CMAC_CTX_new",
-        "CMAC_Init",
-        "CMAC_Update",
-        "CMAC_Final",
-        "CMAC_CTX_copy",
-        "CMAC_CTX_free",
-    ],
-}
diff --git a/src/_cffi_src/openssl/cms.py b/src/_cffi_src/openssl/cms.py
index a43df5d..f0da82d 100644
--- a/src/_cffi_src/openssl/cms.py
+++ b/src/_cffi_src/openssl/cms.py
@@ -116,37 +116,3 @@
                                    const EVP_MD *, unsigned int) = NULL;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_CMS": [
-        "BIO_new_CMS",
-        "i2d_CMS_bio_stream",
-        "PEM_write_bio_CMS_stream",
-        "CMS_final",
-        "CMS_sign",
-        "CMS_verify",
-        "CMS_encrypt",
-        "CMS_decrypt",
-        "CMS_add1_signer",
-        "CMS_TEXT",
-        "CMS_NOCERTS",
-        "CMS_NO_CONTENT_VERIFY",
-        "CMS_NO_ATTR_VERIFY",
-        "CMS_NOSIGS",
-        "CMS_NOINTERN",
-        "CMS_NO_SIGNER_CERT_VERIFY",
-        "CMS_NOVERIFY",
-        "CMS_DETACHED",
-        "CMS_BINARY",
-        "CMS_NOATTR",
-        "CMS_NOSMIMECAP",
-        "CMS_NOOLDMIMETYPE",
-        "CMS_CRLFEOL",
-        "CMS_STREAM",
-        "CMS_NOCRL",
-        "CMS_PARTIAL",
-        "CMS_REUSE_DIGEST",
-        "CMS_USE_KEYID",
-        "CMS_DEBUG_DECRYPT",
-    ]
-}
diff --git a/src/_cffi_src/openssl/conf.py b/src/_cffi_src/openssl/conf.py
index cab246f..c89ae5c 100644
--- a/src/_cffi_src/openssl/conf.py
+++ b/src/_cffi_src/openssl/conf.py
@@ -22,5 +22,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/crypto.py b/src/_cffi_src/openssl/crypto.py
index 641e95a..c66bbe3 100644
--- a/src/_cffi_src/openssl/crypto.py
+++ b/src/_cffi_src/openssl/crypto.py
@@ -54,5 +54,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/dh.py b/src/_cffi_src/openssl/dh.py
index b66e719..8df66f8 100644
--- a/src/_cffi_src/openssl/dh.py
+++ b/src/_cffi_src/openssl/dh.py
@@ -48,5 +48,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/dsa.py b/src/_cffi_src/openssl/dsa.py
index 99a685d..89511e4 100644
--- a/src/_cffi_src/openssl/dsa.py
+++ b/src/_cffi_src/openssl/dsa.py
@@ -52,5 +52,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/ec.py b/src/_cffi_src/openssl/ec.py
index 5ffbea6..93ca275 100644
--- a/src/_cffi_src/openssl/ec.py
+++ b/src/_cffi_src/openssl/ec.py
@@ -404,103 +404,3 @@
 static const long Cryptography_HAS_EC_1_0_2 = 1;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_EC": [
-        "OPENSSL_EC_NAMED_CURVE",
-        "EC_GROUP_new",
-        "EC_GROUP_free",
-        "EC_GROUP_clear_free",
-        "EC_GROUP_new_curve_GFp",
-        "EC_GROUP_new_by_curve_name",
-        "EC_GROUP_set_curve_GFp",
-        "EC_GROUP_get_curve_GFp",
-        "EC_GROUP_method_of",
-        "EC_GROUP_get0_generator",
-        "EC_GROUP_get_curve_name",
-        "EC_GROUP_get_degree",
-        "EC_GROUP_set_asn1_flag",
-        "EC_GROUP_set_point_conversion_form",
-        "EC_KEY_new",
-        "EC_KEY_free",
-        "EC_get_builtin_curves",
-        "EC_KEY_new_by_curve_name",
-        "EC_KEY_copy",
-        "EC_KEY_dup",
-        "EC_KEY_up_ref",
-        "EC_KEY_set_group",
-        "EC_KEY_get0_private_key",
-        "EC_KEY_set_private_key",
-        "EC_KEY_set_public_key",
-        "EC_KEY_get_enc_flags",
-        "EC_KEY_set_enc_flags",
-        "EC_KEY_set_conv_form",
-        "EC_KEY_get_key_method_data",
-        "EC_KEY_insert_key_method_data",
-        "EC_KEY_set_asn1_flag",
-        "EC_KEY_precompute_mult",
-        "EC_KEY_generate_key",
-        "EC_KEY_check_key",
-        "EC_POINT_new",
-        "EC_POINT_free",
-        "EC_POINT_clear_free",
-        "EC_POINT_copy",
-        "EC_POINT_dup",
-        "EC_POINT_method_of",
-        "EC_POINT_set_to_infinity",
-        "EC_POINT_set_Jprojective_coordinates_GFp",
-        "EC_POINT_get_Jprojective_coordinates_GFp",
-        "EC_POINT_set_affine_coordinates_GFp",
-        "EC_POINT_get_affine_coordinates_GFp",
-        "EC_POINT_set_compressed_coordinates_GFp",
-        "EC_POINT_point2oct",
-        "EC_POINT_oct2point",
-        "EC_POINT_point2bn",
-        "EC_POINT_bn2point",
-        "EC_POINT_point2hex",
-        "EC_POINT_hex2point",
-        "EC_POINT_add",
-        "EC_POINT_dbl",
-        "EC_POINT_invert",
-        "EC_POINT_is_at_infinity",
-        "EC_POINT_is_on_curve",
-        "EC_POINT_cmp",
-        "EC_POINT_make_affine",
-        "EC_POINTs_make_affine",
-        "EC_POINTs_mul",
-        "EC_POINT_mul",
-        "EC_GROUP_precompute_mult",
-        "EC_GROUP_have_precompute_mult",
-        "EC_GFp_simple_method",
-        "EC_GFp_mont_method",
-        "EC_GFp_nist_method",
-        "EC_METHOD_get_field_type",
-    ],
-
-    "Cryptography_HAS_EC_1_0_1": [
-        "EC_KEY_get_flags",
-        "EC_KEY_set_flags",
-        "EC_KEY_clear_flags",
-        "EC_KEY_set_public_key_affine_coordinates",
-    ],
-
-    "Cryptography_HAS_EC_NISTP_64_GCC_128": [
-        "EC_GFp_nistp224_method",
-        "EC_GFp_nistp256_method",
-        "EC_GFp_nistp521_method",
-    ],
-
-    "Cryptography_HAS_EC2M": [
-        "EC_GF2m_simple_method",
-        "EC_POINT_set_affine_coordinates_GF2m",
-        "EC_POINT_get_affine_coordinates_GF2m",
-        "EC_POINT_set_compressed_coordinates_GF2m",
-        "EC_GROUP_set_curve_GF2m",
-        "EC_GROUP_get_curve_GF2m",
-        "EC_GROUP_new_curve_GF2m",
-    ],
-
-    "Cryptography_HAS_EC_1_0_2": [
-        "EC_curve_nid2nist",
-    ],
-}
diff --git a/src/_cffi_src/openssl/ecdh.py b/src/_cffi_src/openssl/ecdh.py
index 6c7e010..3116c3b 100644
--- a/src/_cffi_src/openssl/ecdh.py
+++ b/src/_cffi_src/openssl/ecdh.py
@@ -48,12 +48,3 @@
 static const long Cryptography_HAS_ECDH = 1;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_ECDH": [
-        "ECDH_compute_key",
-        "ECDH_get_ex_new_index",
-        "ECDH_set_ex_data",
-        "ECDH_get_ex_data",
-    ],
-}
diff --git a/src/_cffi_src/openssl/ecdsa.py b/src/_cffi_src/openssl/ecdsa.py
index db21025..f231864 100644
--- a/src/_cffi_src/openssl/ecdsa.py
+++ b/src/_cffi_src/openssl/ecdsa.py
@@ -95,27 +95,3 @@
 static const long Cryptography_HAS_ECDSA = 1;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_ECDSA": [
-        "ECDSA_SIG_new",
-        "ECDSA_SIG_free",
-        "i2d_ECDSA_SIG",
-        "d2i_ECDSA_SIG",
-        "ECDSA_do_sign",
-        "ECDSA_do_sign_ex",
-        "ECDSA_do_verify",
-        "ECDSA_sign_setup",
-        "ECDSA_sign",
-        "ECDSA_sign_ex",
-        "ECDSA_verify",
-        "ECDSA_size",
-        "ECDSA_OpenSSL",
-        "ECDSA_set_default_method",
-        "ECDSA_get_default_method",
-        "ECDSA_set_method",
-        "ECDSA_get_ex_new_index",
-        "ECDSA_set_ex_data",
-        "ECDSA_get_ex_data",
-    ],
-}
diff --git a/src/_cffi_src/openssl/engine.py b/src/_cffi_src/openssl/engine.py
index 5079fd6..011f669 100644
--- a/src/_cffi_src/openssl/engine.py
+++ b/src/_cffi_src/openssl/engine.py
@@ -167,9 +167,3 @@
 static const long Cryptography_HAS_ENGINE_CRYPTODEV = 1;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_ENGINE_CRYPTODEV": [
-        "ENGINE_load_cryptodev"
-    ]
-}
diff --git a/src/_cffi_src/openssl/err.py b/src/_cffi_src/openssl/err.py
index 73ce4e3..6ec1377 100644
--- a/src/_cffi_src/openssl/err.py
+++ b/src/_cffi_src/openssl/err.py
@@ -335,29 +335,3 @@
 static const long RSA_R_PKCS_DECODING_ERROR = 0;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_REMOVE_THREAD_STATE": [
-        "ERR_remove_thread_state"
-    ],
-    "Cryptography_HAS_098H_ERROR_CODES": [
-        "ASN1_F_B64_READ_ASN1",
-        "ASN1_F_B64_WRITE_ASN1",
-        "ASN1_F_SMIME_READ_ASN1",
-        "ASN1_F_SMIME_TEXT",
-        "ASN1_R_NO_CONTENT_TYPE",
-        "ASN1_R_NO_MULTIPART_BODY_FAILURE",
-        "ASN1_R_NO_MULTIPART_BOUNDARY",
-    ],
-    "Cryptography_HAS_098C_CAMELLIA_CODES": [
-        "EVP_F_CAMELLIA_INIT_KEY",
-        "EVP_R_CAMELLIA_KEY_SETUP_FAILED"
-    ],
-    "Cryptography_HAS_EC_CODES": [
-        "EC_R_UNKNOWN_GROUP",
-        "EC_F_EC_GROUP_NEW_BY_CURVE_NAME"
-    ],
-    "Cryptography_HAS_RSA_R_PKCS_DECODING_ERROR": [
-        "RSA_R_PKCS_DECODING_ERROR"
-    ]
-}
diff --git a/src/_cffi_src/openssl/evp.py b/src/_cffi_src/openssl/evp.py
index 93aa83d..6d17cb7 100644
--- a/src/_cffi_src/openssl/evp.py
+++ b/src/_cffi_src/openssl/evp.py
@@ -231,35 +231,3 @@
 int (*EVP_PKEY_set1_EC_KEY)(EVP_PKEY *, EC_KEY *) = NULL;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_GCM": [
-        "EVP_CTRL_GCM_GET_TAG",
-        "EVP_CTRL_GCM_SET_TAG",
-        "EVP_CTRL_GCM_SET_IVLEN",
-    ],
-    "Cryptography_HAS_PBKDF2_HMAC": [
-        "PKCS5_PBKDF2_HMAC"
-    ],
-    "Cryptography_HAS_PKEY_CTX": [
-        "EVP_PKEY_CTX_new",
-        "EVP_PKEY_CTX_new_id",
-        "EVP_PKEY_CTX_dup",
-        "EVP_PKEY_CTX_free",
-        "EVP_PKEY_sign",
-        "EVP_PKEY_sign_init",
-        "EVP_PKEY_verify",
-        "EVP_PKEY_verify_init",
-        "Cryptography_EVP_PKEY_encrypt",
-        "EVP_PKEY_encrypt_init",
-        "Cryptography_EVP_PKEY_decrypt",
-        "EVP_PKEY_decrypt_init",
-        "EVP_PKEY_CTX_set_signature_md",
-        "EVP_PKEY_id",
-    ],
-    "Cryptography_HAS_EC": [
-        "EVP_PKEY_assign_EC_KEY",
-        "EVP_PKEY_get1_EC_KEY",
-        "EVP_PKEY_set1_EC_KEY",
-    ]
-}
diff --git a/src/_cffi_src/openssl/hmac.py b/src/_cffi_src/openssl/hmac.py
index 86bbdfc..7178e57 100644
--- a/src/_cffi_src/openssl/hmac.py
+++ b/src/_cffi_src/openssl/hmac.py
@@ -81,5 +81,3 @@
 #endif
 }
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/nid.py b/src/_cffi_src/openssl/nid.py
index c2c0552..94f21c6 100644
--- a/src/_cffi_src/openssl/nid.py
+++ b/src/_cffi_src/openssl/nid.py
@@ -237,12 +237,3 @@
 static const int NID_ecdsa_with_SHA512 = 0;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_ECDSA_SHA2_NIDS": [
-        "NID_ecdsa_with_SHA224",
-        "NID_ecdsa_with_SHA256",
-        "NID_ecdsa_with_SHA384",
-        "NID_ecdsa_with_SHA512",
-    ],
-}
diff --git a/src/_cffi_src/openssl/objects.py b/src/_cffi_src/openssl/objects.py
index 9c480b3..f2c1d5f 100644
--- a/src/_cffi_src/openssl/objects.py
+++ b/src/_cffi_src/openssl/objects.py
@@ -32,5 +32,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/opensslv.py b/src/_cffi_src/openssl/opensslv.py
index e6c5f26..a4e88f0 100644
--- a/src/_cffi_src/openssl/opensslv.py
+++ b/src/_cffi_src/openssl/opensslv.py
@@ -23,5 +23,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/pem.py b/src/_cffi_src/openssl/pem.py
index 8ec3fef..846e64e 100644
--- a/src/_cffi_src/openssl/pem.py
+++ b/src/_cffi_src/openssl/pem.py
@@ -90,9 +90,3 @@
 #endif
 
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_EC": [
-        "PEM_write_bio_ECPrivateKey"
-    ]
-}
diff --git a/src/_cffi_src/openssl/pkcs12.py b/src/_cffi_src/openssl/pkcs12.py
index fa7564a..0bbd1e5 100644
--- a/src/_cffi_src/openssl/pkcs12.py
+++ b/src/_cffi_src/openssl/pkcs12.py
@@ -28,5 +28,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/pkcs7.py b/src/_cffi_src/openssl/pkcs7.py
index df82afe..5d6ee45 100644
--- a/src/_cffi_src/openssl/pkcs7.py
+++ b/src/_cffi_src/openssl/pkcs7.py
@@ -54,5 +54,3 @@
 """
 
 CUSTOMIZATIONS = ""
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/rand.py b/src/_cffi_src/openssl/rand.py
index 6330482..91e1a39 100644
--- a/src/_cffi_src/openssl/rand.py
+++ b/src/_cffi_src/openssl/rand.py
@@ -41,11 +41,3 @@
 static const long Cryptography_HAS_EGD = 1;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_EGD": [
-        "RAND_egd",
-        "RAND_egd_bytes",
-        "RAND_query_egd_bytes",
-    ]
-}
diff --git a/src/_cffi_src/openssl/rsa.py b/src/_cffi_src/openssl/rsa.py
index 8bac789..1676950 100644
--- a/src/_cffi_src/openssl/rsa.py
+++ b/src/_cffi_src/openssl/rsa.py
@@ -84,16 +84,3 @@
 int (*EVP_PKEY_CTX_set_rsa_mgf1_md)(EVP_PKEY_CTX *, EVP_MD *) = NULL;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_PKEY_CTX": [
-        "EVP_PKEY_CTX_set_rsa_padding",
-        "EVP_PKEY_CTX_set_rsa_pss_saltlen",
-    ],
-    "Cryptography_HAS_PSS_PADDING": [
-        "RSA_PKCS1_PSS_PADDING",
-    ],
-    "Cryptography_HAS_MGF1_MD": [
-        "EVP_PKEY_CTX_set_rsa_mgf1_md",
-    ],
-}
diff --git a/src/_cffi_src/openssl/ssl.py b/src/_cffi_src/openssl/ssl.py
index 5841ee2..f15b9b3 100644
--- a/src/_cffi_src/openssl/ssl.py
+++ b/src/_cffi_src/openssl/ssl.py
@@ -624,114 +624,3 @@
 #endif
 
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_TLSv1_1": [
-        "SSL_OP_NO_TLSv1_1",
-        "TLSv1_1_method",
-        "TLSv1_1_server_method",
-        "TLSv1_1_client_method",
-    ],
-
-    "Cryptography_HAS_TLSv1_2": [
-        "SSL_OP_NO_TLSv1_2",
-        "TLSv1_2_method",
-        "TLSv1_2_server_method",
-        "TLSv1_2_client_method",
-    ],
-
-    "Cryptography_HAS_SSL2": [
-        "SSLv2_method",
-        "SSLv2_client_method",
-        "SSLv2_server_method",
-    ],
-
-    "Cryptography_HAS_SSL3_METHOD": [
-        "SSLv3_method",
-        "SSLv3_client_method",
-        "SSLv3_server_method",
-    ],
-
-    "Cryptography_HAS_TLSEXT_HOSTNAME": [
-        "SSL_set_tlsext_host_name",
-        "SSL_get_servername",
-        "SSL_CTX_set_tlsext_servername_callback",
-    ],
-
-    "Cryptography_HAS_TLSEXT_STATUS_REQ_CB": [
-        "SSL_CTX_set_tlsext_status_cb",
-        "SSL_CTX_set_tlsext_status_arg"
-    ],
-
-    "Cryptography_HAS_STATUS_REQ_OCSP_RESP": [
-        "SSL_set_tlsext_status_ocsp_resp",
-        "SSL_get_tlsext_status_ocsp_resp",
-    ],
-
-    "Cryptography_HAS_TLSEXT_STATUS_REQ_TYPE": [
-        "SSL_set_tlsext_status_type",
-    ],
-
-    "Cryptography_HAS_RELEASE_BUFFERS": [
-        "SSL_MODE_RELEASE_BUFFERS",
-    ],
-
-    "Cryptography_HAS_OP_NO_COMPRESSION": [
-        "SSL_OP_NO_COMPRESSION",
-    ],
-
-    "Cryptography_HAS_SSL_OP_MSIE_SSLV2_RSA_PADDING": [
-        "SSL_OP_MSIE_SSLV2_RSA_PADDING",
-    ],
-
-    "Cryptography_HAS_EC": [
-        "SSL_CTX_set_tmp_ecdh",
-    ],
-
-    "Cryptography_HAS_SSL_OP_NO_TICKET": [
-        "SSL_OP_NO_TICKET",
-    ],
-
-    "Cryptography_HAS_SSL_SET_SSL_CTX": [
-        "SSL_set_SSL_CTX",
-        "TLSEXT_NAMETYPE_host_name",
-    ],
-
-    "Cryptography_HAS_NETBSD_D1_METH": [
-        "DTLSv1_method",
-    ],
-
-    "Cryptography_HAS_NEXTPROTONEG": [
-        "SSL_CTX_set_next_protos_advertised_cb",
-        "SSL_CTX_set_next_proto_select_cb",
-        "SSL_select_next_proto",
-        "SSL_get0_next_proto_negotiated",
-    ],
-
-    "Cryptography_HAS_SECURE_RENEGOTIATION": [
-        "SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION",
-        "SSL_OP_LEGACY_SERVER_CONNECT",
-        "SSL_get_secure_renegotiation_support",
-    ],
-
-    "Cryptography_HAS_ALPN": [
-        "SSL_CTX_set_alpn_protos",
-        "SSL_set_alpn_protos",
-        "SSL_CTX_set_alpn_select_cb",
-        "SSL_get0_alpn_selected",
-    ],
-
-    "Cryptography_HAS_COMPRESSION": [
-        "SSL_get_current_compression",
-        "SSL_get_current_expansion",
-        "SSL_COMP_get_name",
-    ],
-
-    "Cryptography_HAS_GET_SERVER_TMP_KEY": [
-        "SSL_get_server_tmp_key",
-    ],
-
-    "Cryptography_HAS_SSL_CTX_SET_CLIENT_CERT_ENGINE": [
-        "SSL_CTX_set_client_cert_engine",
-    ],
-}
diff --git a/src/_cffi_src/openssl/x509.py b/src/_cffi_src/openssl/x509.py
index bdcc171..468d74e 100644
--- a/src/_cffi_src/openssl/x509.py
+++ b/src/_cffi_src/openssl/x509.py
@@ -348,18 +348,3 @@
 int (*i2o_ECPublicKey)(EC_KEY *, unsigned char **) = NULL;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_EC": [
-        "i2d_EC_PUBKEY",
-        "d2i_EC_PUBKEY",
-        "d2i_EC_PUBKEY_bio",
-        "i2d_EC_PUBKEY_bio",
-        "d2i_ECPrivateKey",
-        "d2i_ECPrivateKey_bio",
-        "i2d_ECPrivateKey",
-        "i2d_ECPrivateKey_bio",
-        "i2o_ECPublicKey",
-        "o2i_ECPublicKey",
-    ]
-}
diff --git a/src/_cffi_src/openssl/x509_vfy.py b/src/_cffi_src/openssl/x509_vfy.py
index 23ac848..2f640b1 100644
--- a/src/_cffi_src/openssl/x509_vfy.py
+++ b/src/_cffi_src/openssl/x509_vfy.py
@@ -295,53 +295,3 @@
 static const long X509_V_FLAG_CHECK_SS_SIGNATURE = 0;
 #endif
 """
-
-CONDITIONAL_NAMES = {
-    "Cryptography_HAS_102_VERIFICATION_ERROR_CODES": [
-        'X509_V_ERR_SUITE_B_INVALID_VERSION',
-        'X509_V_ERR_SUITE_B_INVALID_ALGORITHM',
-        'X509_V_ERR_SUITE_B_INVALID_CURVE',
-        'X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM',
-        'X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED',
-        'X509_V_ERR_SUITE_B_CANNOT_SIGN_P_384_WITH_P_256',
-        'X509_V_ERR_HOSTNAME_MISMATCH',
-        'X509_V_ERR_EMAIL_MISMATCH',
-        'X509_V_ERR_IP_ADDRESS_MISMATCH'
-    ],
-    "Cryptography_HAS_102_VERIFICATION_PARAMS": [
-        "X509_V_FLAG_SUITEB_128_LOS_ONLY",
-        "X509_V_FLAG_SUITEB_192_LOS",
-        "X509_V_FLAG_SUITEB_128_LOS",
-        "X509_VERIFY_PARAM_set1_host",
-        "X509_VERIFY_PARAM_set1_email",
-        "X509_VERIFY_PARAM_set1_ip",
-        "X509_VERIFY_PARAM_set1_ip_asc",
-        "X509_VERIFY_PARAM_set_hostflags",
-    ],
-    "Cryptography_HAS_X509_V_FLAG_TRUSTED_FIRST": [
-        "X509_V_FLAG_TRUSTED_FIRST",
-    ],
-    "Cryptography_HAS_X509_V_FLAG_PARTIAL_CHAIN": [
-        "X509_V_FLAG_PARTIAL_CHAIN",
-    ],
-    "Cryptography_HAS_100_VERIFICATION_ERROR_CODES": [
-        'X509_V_ERR_DIFFERENT_CRL_SCOPE',
-        'X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE',
-        'X509_V_ERR_UNNESTED_RESOURCE',
-        'X509_V_ERR_PERMITTED_VIOLATION',
-        'X509_V_ERR_EXCLUDED_VIOLATION',
-        'X509_V_ERR_SUBTREE_MINMAX',
-        'X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE',
-        'X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX',
-        'X509_V_ERR_UNSUPPORTED_NAME_SYNTAX',
-        'X509_V_ERR_CRL_PATH_VALIDATION_ERROR',
-    ],
-    "Cryptography_HAS_100_VERIFICATION_PARAMS": [
-        "Cryptography_HAS_100_VERIFICATION_PARAMS",
-        "X509_V_FLAG_EXTENDED_CRL_SUPPORT",
-        "X509_V_FLAG_USE_DELTAS",
-    ],
-    "Cryptography_HAS_X509_V_FLAG_CHECK_SS_SIGNATURE": [
-        "X509_V_FLAG_CHECK_SS_SIGNATURE",
-    ]
-}
diff --git a/src/_cffi_src/openssl/x509name.py b/src/_cffi_src/openssl/x509name.py
index be5b3a7..2d87db4 100644
--- a/src/_cffi_src/openssl/x509name.py
+++ b/src/_cffi_src/openssl/x509name.py
@@ -59,5 +59,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/openssl/x509v3.py b/src/_cffi_src/openssl/x509v3.py
index fc3c6d4..f6a1890 100644
--- a/src/_cffi_src/openssl/x509v3.py
+++ b/src/_cffi_src/openssl/x509v3.py
@@ -288,5 +288,3 @@
 
 CUSTOMIZATIONS = """
 """
-
-CONDITIONAL_NAMES = {}
diff --git a/src/_cffi_src/utils.py b/src/_cffi_src/utils.py
index 65f9f12..0b00353 100644
--- a/src/_cffi_src/utils.py
+++ b/src/_cffi_src/utils.py
@@ -22,9 +22,6 @@
     * ``CUSTOMIZATIONS``: A string containing arbitrary top-level C code, this
         can be used to do things like test for a define and provide an
         alternate implementation based on that.
-    * ``CONDITIONAL_NAMES``: A dict mapping strings of condition names from the
-        library to a list of names which will not be present without the
-        condition.
     """
     types = []
     includes = []
diff --git a/src/cryptography/hazmat/bindings/openssl/_conditional.py b/src/cryptography/hazmat/bindings/openssl/_conditional.py
new file mode 100644
index 0000000..adf00b0
--- /dev/null
+++ b/src/cryptography/hazmat/bindings/openssl/_conditional.py
@@ -0,0 +1,414 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+# This is a temporary copy of all the CONDITIONAL_NAMES from _cffi_src so
+# we can loop over them and delete them at runtime. It will be removed when
+# cffi supports #if in cdef
+
+CONDITIONAL_NAMES = {
+    "Cryptography_HAS_AES_WRAP": [
+        "AES_wrap_key",
+        "AES_unwrap_key",
+    ],
+    "Cryptography_HAS_CMAC": [
+        "CMAC_CTX_new",
+        "CMAC_Init",
+        "CMAC_Update",
+        "CMAC_Final",
+        "CMAC_CTX_copy",
+        "CMAC_CTX_free",
+    ],
+    "Cryptography_HAS_CMS": [
+        "BIO_new_CMS",
+        "i2d_CMS_bio_stream",
+        "PEM_write_bio_CMS_stream",
+        "CMS_final",
+        "CMS_sign",
+        "CMS_verify",
+        "CMS_encrypt",
+        "CMS_decrypt",
+        "CMS_add1_signer",
+        "CMS_TEXT",
+        "CMS_NOCERTS",
+        "CMS_NO_CONTENT_VERIFY",
+        "CMS_NO_ATTR_VERIFY",
+        "CMS_NOSIGS",
+        "CMS_NOINTERN",
+        "CMS_NO_SIGNER_CERT_VERIFY",
+        "CMS_NOVERIFY",
+        "CMS_DETACHED",
+        "CMS_BINARY",
+        "CMS_NOATTR",
+        "CMS_NOSMIMECAP",
+        "CMS_NOOLDMIMETYPE",
+        "CMS_CRLFEOL",
+        "CMS_STREAM",
+        "CMS_NOCRL",
+        "CMS_PARTIAL",
+        "CMS_REUSE_DIGEST",
+        "CMS_USE_KEYID",
+        "CMS_DEBUG_DECRYPT",
+    ],
+    "Cryptography_HAS_EC": [
+        "OPENSSL_EC_NAMED_CURVE",
+        "EC_GROUP_new",
+        "EC_GROUP_free",
+        "EC_GROUP_clear_free",
+        "EC_GROUP_new_curve_GFp",
+        "EC_GROUP_new_by_curve_name",
+        "EC_GROUP_set_curve_GFp",
+        "EC_GROUP_get_curve_GFp",
+        "EC_GROUP_method_of",
+        "EC_GROUP_get0_generator",
+        "EC_GROUP_get_curve_name",
+        "EC_GROUP_get_degree",
+        "EC_GROUP_set_asn1_flag",
+        "EC_GROUP_set_point_conversion_form",
+        "EC_KEY_new",
+        "EC_KEY_free",
+        "EC_get_builtin_curves",
+        "EC_KEY_new_by_curve_name",
+        "EC_KEY_copy",
+        "EC_KEY_dup",
+        "EC_KEY_up_ref",
+        "EC_KEY_set_group",
+        "EC_KEY_get0_private_key",
+        "EC_KEY_set_private_key",
+        "EC_KEY_set_public_key",
+        "EC_KEY_get_enc_flags",
+        "EC_KEY_set_enc_flags",
+        "EC_KEY_set_conv_form",
+        "EC_KEY_get_key_method_data",
+        "EC_KEY_insert_key_method_data",
+        "EC_KEY_set_asn1_flag",
+        "EC_KEY_precompute_mult",
+        "EC_KEY_generate_key",
+        "EC_KEY_check_key",
+        "EC_POINT_new",
+        "EC_POINT_free",
+        "EC_POINT_clear_free",
+        "EC_POINT_copy",
+        "EC_POINT_dup",
+        "EC_POINT_method_of",
+        "EC_POINT_set_to_infinity",
+        "EC_POINT_set_Jprojective_coordinates_GFp",
+        "EC_POINT_get_Jprojective_coordinates_GFp",
+        "EC_POINT_set_affine_coordinates_GFp",
+        "EC_POINT_get_affine_coordinates_GFp",
+        "EC_POINT_set_compressed_coordinates_GFp",
+        "EC_POINT_point2oct",
+        "EC_POINT_oct2point",
+        "EC_POINT_point2bn",
+        "EC_POINT_bn2point",
+        "EC_POINT_point2hex",
+        "EC_POINT_hex2point",
+        "EC_POINT_add",
+        "EC_POINT_dbl",
+        "EC_POINT_invert",
+        "EC_POINT_is_at_infinity",
+        "EC_POINT_is_on_curve",
+        "EC_POINT_cmp",
+        "EC_POINT_make_affine",
+        "EC_POINTs_make_affine",
+        "EC_POINTs_mul",
+        "EC_POINT_mul",
+        "EC_GROUP_precompute_mult",
+        "EC_GROUP_have_precompute_mult",
+        "EC_GFp_simple_method",
+        "EC_GFp_mont_method",
+        "EC_GFp_nist_method",
+        "EC_METHOD_get_field_type",
+        "EVP_PKEY_assign_EC_KEY",
+        "EVP_PKEY_get1_EC_KEY",
+        "EVP_PKEY_set1_EC_KEY",
+        "PEM_write_bio_ECPrivateKey",
+        "i2d_EC_PUBKEY",
+        "d2i_EC_PUBKEY",
+        "d2i_EC_PUBKEY_bio",
+        "i2d_EC_PUBKEY_bio",
+        "d2i_ECPrivateKey",
+        "d2i_ECPrivateKey_bio",
+        "i2d_ECPrivateKey",
+        "i2d_ECPrivateKey_bio",
+        "i2o_ECPublicKey",
+        "o2i_ECPublicKey",
+        "SSL_CTX_set_tmp_ecdh",
+    ],
+
+    "Cryptography_HAS_EC_1_0_1": [
+        "EC_KEY_get_flags",
+        "EC_KEY_set_flags",
+        "EC_KEY_clear_flags",
+        "EC_KEY_set_public_key_affine_coordinates",
+    ],
+
+    "Cryptography_HAS_EC_NISTP_64_GCC_128": [
+        "EC_GFp_nistp224_method",
+        "EC_GFp_nistp256_method",
+        "EC_GFp_nistp521_method",
+    ],
+
+    "Cryptography_HAS_EC2M": [
+        "EC_GF2m_simple_method",
+        "EC_POINT_set_affine_coordinates_GF2m",
+        "EC_POINT_get_affine_coordinates_GF2m",
+        "EC_POINT_set_compressed_coordinates_GF2m",
+        "EC_GROUP_set_curve_GF2m",
+        "EC_GROUP_get_curve_GF2m",
+        "EC_GROUP_new_curve_GF2m",
+    ],
+
+    "Cryptography_HAS_EC_1_0_2": [
+        "EC_curve_nid2nist",
+    ],
+    "Cryptography_HAS_ECDH": [
+        "ECDH_compute_key",
+        "ECDH_get_ex_new_index",
+        "ECDH_set_ex_data",
+        "ECDH_get_ex_data",
+    ],
+    "Cryptography_HAS_ECDSA": [
+        "ECDSA_SIG_new",
+        "ECDSA_SIG_free",
+        "i2d_ECDSA_SIG",
+        "d2i_ECDSA_SIG",
+        "ECDSA_do_sign",
+        "ECDSA_do_sign_ex",
+        "ECDSA_do_verify",
+        "ECDSA_sign_setup",
+        "ECDSA_sign",
+        "ECDSA_sign_ex",
+        "ECDSA_verify",
+        "ECDSA_size",
+        "ECDSA_OpenSSL",
+        "ECDSA_set_default_method",
+        "ECDSA_get_default_method",
+        "ECDSA_set_method",
+        "ECDSA_get_ex_new_index",
+        "ECDSA_set_ex_data",
+        "ECDSA_get_ex_data",
+    ],
+    "Cryptography_HAS_ENGINE_CRYPTODEV": [
+        "ENGINE_load_cryptodev"
+    ],
+    "Cryptography_HAS_REMOVE_THREAD_STATE": [
+        "ERR_remove_thread_state"
+    ],
+    "Cryptography_HAS_098H_ERROR_CODES": [
+        "ASN1_F_B64_READ_ASN1",
+        "ASN1_F_B64_WRITE_ASN1",
+        "ASN1_F_SMIME_READ_ASN1",
+        "ASN1_F_SMIME_TEXT",
+        "ASN1_R_NO_CONTENT_TYPE",
+        "ASN1_R_NO_MULTIPART_BODY_FAILURE",
+        "ASN1_R_NO_MULTIPART_BOUNDARY",
+    ],
+    "Cryptography_HAS_098C_CAMELLIA_CODES": [
+        "EVP_F_CAMELLIA_INIT_KEY",
+        "EVP_R_CAMELLIA_KEY_SETUP_FAILED"
+    ],
+    "Cryptography_HAS_EC_CODES": [
+        "EC_R_UNKNOWN_GROUP",
+        "EC_F_EC_GROUP_NEW_BY_CURVE_NAME"
+    ],
+    "Cryptography_HAS_RSA_R_PKCS_DECODING_ERROR": [
+        "RSA_R_PKCS_DECODING_ERROR"
+    ],
+    "Cryptography_HAS_GCM": [
+        "EVP_CTRL_GCM_GET_TAG",
+        "EVP_CTRL_GCM_SET_TAG",
+        "EVP_CTRL_GCM_SET_IVLEN",
+    ],
+    "Cryptography_HAS_PBKDF2_HMAC": [
+        "PKCS5_PBKDF2_HMAC"
+    ],
+    "Cryptography_HAS_PKEY_CTX": [
+        "EVP_PKEY_CTX_new",
+        "EVP_PKEY_CTX_new_id",
+        "EVP_PKEY_CTX_dup",
+        "EVP_PKEY_CTX_free",
+        "EVP_PKEY_sign",
+        "EVP_PKEY_sign_init",
+        "EVP_PKEY_verify",
+        "EVP_PKEY_verify_init",
+        "Cryptography_EVP_PKEY_encrypt",
+        "EVP_PKEY_encrypt_init",
+        "Cryptography_EVP_PKEY_decrypt",
+        "EVP_PKEY_decrypt_init",
+        "EVP_PKEY_CTX_set_signature_md",
+        "EVP_PKEY_id",
+        "EVP_PKEY_CTX_set_rsa_padding",
+        "EVP_PKEY_CTX_set_rsa_pss_saltlen",
+    ],
+    "Cryptography_HAS_ECDSA_SHA2_NIDS": [
+        "NID_ecdsa_with_SHA224",
+        "NID_ecdsa_with_SHA256",
+        "NID_ecdsa_with_SHA384",
+        "NID_ecdsa_with_SHA512",
+    ],
+    "Cryptography_HAS_EGD": [
+        "RAND_egd",
+        "RAND_egd_bytes",
+        "RAND_query_egd_bytes",
+    ],
+    "Cryptography_HAS_PSS_PADDING": [
+        "RSA_PKCS1_PSS_PADDING",
+    ],
+    "Cryptography_HAS_MGF1_MD": [
+        "EVP_PKEY_CTX_set_rsa_mgf1_md",
+    ],
+    "Cryptography_HAS_TLSv1_1": [
+        "SSL_OP_NO_TLSv1_1",
+        "TLSv1_1_method",
+        "TLSv1_1_server_method",
+        "TLSv1_1_client_method",
+    ],
+
+    "Cryptography_HAS_TLSv1_2": [
+        "SSL_OP_NO_TLSv1_2",
+        "TLSv1_2_method",
+        "TLSv1_2_server_method",
+        "TLSv1_2_client_method",
+    ],
+
+    "Cryptography_HAS_SSL2": [
+        "SSLv2_method",
+        "SSLv2_client_method",
+        "SSLv2_server_method",
+    ],
+
+    "Cryptography_HAS_SSL3_METHOD": [
+        "SSLv3_method",
+        "SSLv3_client_method",
+        "SSLv3_server_method",
+    ],
+
+    "Cryptography_HAS_TLSEXT_HOSTNAME": [
+        "SSL_set_tlsext_host_name",
+        "SSL_get_servername",
+        "SSL_CTX_set_tlsext_servername_callback",
+    ],
+
+    "Cryptography_HAS_TLSEXT_STATUS_REQ_CB": [
+        "SSL_CTX_set_tlsext_status_cb",
+        "SSL_CTX_set_tlsext_status_arg"
+    ],
+
+    "Cryptography_HAS_STATUS_REQ_OCSP_RESP": [
+        "SSL_set_tlsext_status_ocsp_resp",
+        "SSL_get_tlsext_status_ocsp_resp",
+    ],
+
+    "Cryptography_HAS_TLSEXT_STATUS_REQ_TYPE": [
+        "SSL_set_tlsext_status_type",
+    ],
+
+    "Cryptography_HAS_RELEASE_BUFFERS": [
+        "SSL_MODE_RELEASE_BUFFERS",
+    ],
+
+    "Cryptography_HAS_OP_NO_COMPRESSION": [
+        "SSL_OP_NO_COMPRESSION",
+    ],
+
+    "Cryptography_HAS_SSL_OP_MSIE_SSLV2_RSA_PADDING": [
+        "SSL_OP_MSIE_SSLV2_RSA_PADDING",
+    ],
+
+    "Cryptography_HAS_SSL_OP_NO_TICKET": [
+        "SSL_OP_NO_TICKET",
+    ],
+
+    "Cryptography_HAS_SSL_SET_SSL_CTX": [
+        "SSL_set_SSL_CTX",
+        "TLSEXT_NAMETYPE_host_name",
+    ],
+
+    "Cryptography_HAS_NETBSD_D1_METH": [
+        "DTLSv1_method",
+    ],
+
+    "Cryptography_HAS_NEXTPROTONEG": [
+        "SSL_CTX_set_next_protos_advertised_cb",
+        "SSL_CTX_set_next_proto_select_cb",
+        "SSL_select_next_proto",
+        "SSL_get0_next_proto_negotiated",
+    ],
+
+    "Cryptography_HAS_SECURE_RENEGOTIATION": [
+        "SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION",
+        "SSL_OP_LEGACY_SERVER_CONNECT",
+        "SSL_get_secure_renegotiation_support",
+    ],
+
+    "Cryptography_HAS_ALPN": [
+        "SSL_CTX_set_alpn_protos",
+        "SSL_set_alpn_protos",
+        "SSL_CTX_set_alpn_select_cb",
+        "SSL_get0_alpn_selected",
+    ],
+
+    "Cryptography_HAS_COMPRESSION": [
+        "SSL_get_current_compression",
+        "SSL_get_current_expansion",
+        "SSL_COMP_get_name",
+    ],
+
+    "Cryptography_HAS_GET_SERVER_TMP_KEY": [
+        "SSL_get_server_tmp_key",
+    ],
+
+    "Cryptography_HAS_SSL_CTX_SET_CLIENT_CERT_ENGINE": [
+        "SSL_CTX_set_client_cert_engine",
+    ],
+    "Cryptography_HAS_102_VERIFICATION_ERROR_CODES": [
+        'X509_V_ERR_SUITE_B_INVALID_VERSION',
+        'X509_V_ERR_SUITE_B_INVALID_ALGORITHM',
+        'X509_V_ERR_SUITE_B_INVALID_CURVE',
+        'X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM',
+        'X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED',
+        'X509_V_ERR_SUITE_B_CANNOT_SIGN_P_384_WITH_P_256',
+        'X509_V_ERR_HOSTNAME_MISMATCH',
+        'X509_V_ERR_EMAIL_MISMATCH',
+        'X509_V_ERR_IP_ADDRESS_MISMATCH'
+    ],
+    "Cryptography_HAS_102_VERIFICATION_PARAMS": [
+        "X509_V_FLAG_SUITEB_128_LOS_ONLY",
+        "X509_V_FLAG_SUITEB_192_LOS",
+        "X509_V_FLAG_SUITEB_128_LOS",
+        "X509_VERIFY_PARAM_set1_host",
+        "X509_VERIFY_PARAM_set1_email",
+        "X509_VERIFY_PARAM_set1_ip",
+        "X509_VERIFY_PARAM_set1_ip_asc",
+        "X509_VERIFY_PARAM_set_hostflags",
+    ],
+    "Cryptography_HAS_X509_V_FLAG_TRUSTED_FIRST": [
+        "X509_V_FLAG_TRUSTED_FIRST",
+    ],
+    "Cryptography_HAS_X509_V_FLAG_PARTIAL_CHAIN": [
+        "X509_V_FLAG_PARTIAL_CHAIN",
+    ],
+    "Cryptography_HAS_100_VERIFICATION_ERROR_CODES": [
+        'X509_V_ERR_DIFFERENT_CRL_SCOPE',
+        'X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE',
+        'X509_V_ERR_UNNESTED_RESOURCE',
+        'X509_V_ERR_PERMITTED_VIOLATION',
+        'X509_V_ERR_EXCLUDED_VIOLATION',
+        'X509_V_ERR_SUBTREE_MINMAX',
+        'X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE',
+        'X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX',
+        'X509_V_ERR_UNSUPPORTED_NAME_SYNTAX',
+        'X509_V_ERR_CRL_PATH_VALIDATION_ERROR',
+    ],
+    "Cryptography_HAS_100_VERIFICATION_PARAMS": [
+        "Cryptography_HAS_100_VERIFICATION_PARAMS",
+        "X509_V_FLAG_EXTENDED_CRL_SUPPORT",
+        "X509_V_FLAG_USE_DELTAS",
+    ],
+    "Cryptography_HAS_X509_V_FLAG_CHECK_SS_SIGNATURE": [
+        "X509_V_FLAG_CHECK_SS_SIGNATURE",
+    ]
+}
diff --git a/src/cryptography/hazmat/bindings/openssl/binding.py b/src/cryptography/hazmat/bindings/openssl/binding.py
index 86fac5c..e18d89c 100644
--- a/src/cryptography/hazmat/bindings/openssl/binding.py
+++ b/src/cryptography/hazmat/bindings/openssl/binding.py
@@ -6,8 +6,10 @@
 
 import os
 import threading
+import types
 
 from cryptography.hazmat.bindings._openssl import ffi, lib
+from cryptography.hazmat.bindings.openssl._conditional import CONDITIONAL_NAMES
 
 
 @ffi.callback("int (*)(unsigned char *, int)", error=-1)
@@ -23,11 +25,25 @@
     return 1
 
 
+def build_conditional_library(lib, conditional_names):
+    conditional_lib = types.ModuleType("lib")
+    excluded_names = set()
+    for condition, names in conditional_names.items():
+        if not getattr(lib, condition):
+            excluded_names |= set(names)
+
+    for attr in dir(lib):
+        if attr not in excluded_names:
+            setattr(conditional_lib, attr, getattr(lib, attr))
+
+    return conditional_lib
+
+
 class Binding(object):
     """
     OpenSSL API wrapper.
     """
-    lib = lib
+    lib = None
     ffi = ffi
     _lib_loaded = False
     _locks = None
@@ -74,6 +90,7 @@
     def _ensure_ffi_initialized(cls):
         with cls._init_lock:
             if not cls._lib_loaded:
+                cls.lib = build_conditional_library(lib, CONDITIONAL_NAMES)
                 cls._lib_loaded = True
                 cls._register_osrandom_engine()
 
diff --git a/tests/hazmat/bindings/test_openssl.py b/tests/hazmat/bindings/test_openssl.py
index 75a8e3f..20171fa 100644
--- a/tests/hazmat/bindings/test_openssl.py
+++ b/tests/hazmat/bindings/test_openssl.py
@@ -131,3 +131,21 @@
         expected_options = current_options | b.lib.SSL_OP_ALL
         assert resp == expected_options
         assert b.lib.SSL_get_mode(ssl) == expected_options
+
+    def test_conditional_removal(self):
+        b = Binding()
+        if b.lib.OPENSSL_VERSION_NUMBER >= 0x10000000:
+            assert b.lib.X509_V_ERR_DIFFERENT_CRL_SCOPE
+            assert b.lib.X509_V_ERR_CRL_PATH_VALIDATION_ERROR
+        else:
+            with pytest.raises(AttributeError):
+                b.lib.X509_V_ERR_DIFFERENT_CRL_SCOPE
+
+            with pytest.raises(AttributeError):
+                b.lib.X509_V_ERR_CRL_PATH_VALIDATION_ERROR
+
+        if b.lib.OPENSSL_VERSION_NUMBER >= 0x10001000:
+            assert b.lib.CMAC_Init
+        else:
+            with pytest.raises(AttributeError):
+                b.lib.CMAC_Init