Expose SSL_CTX_set_cert_verify_callback
diff --git a/src/cryptography/hazmat/bindings/openssl/ssl.py b/src/cryptography/hazmat/bindings/openssl/ssl.py
index b182180..4a824ae 100644
--- a/src/cryptography/hazmat/bindings/openssl/ssl.py
+++ b/src/cryptography/hazmat/bindings/openssl/ssl.py
@@ -211,6 +211,9 @@
int SSL_CTX_use_PrivateKey(SSL_CTX *, EVP_PKEY *);
int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
int SSL_CTX_check_private_key(const SSL_CTX *);
+void SSL_CTX_set_cert_verify_callback(SSL_CTX *,
+ int (*)(X509_STORE_CTX *,void *),
+ void *);
void SSL_CTX_set_cert_store(SSL_CTX *, X509_STORE *);
X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *);