Revert "Revert "Implement Server Backward Compatibility""
diff --git a/config.m4 b/config.m4
index 99baebf..a702845 100644
--- a/config.m4
+++ b/config.m4
@@ -331,6 +331,8 @@
     src/core/ext/census/tracing.c \
     src/core/ext/filters/max_age/max_age_filter.c \
     src/core/ext/filters/message_size/message_size_filter.c \
+    src/core/ext/filters/workarounds/workaround_cronet_compression_filter.c \
+    src/core/ext/filters/workarounds/workaround_utils.c \
     src/core/plugin_registry/grpc_plugin_registry.c \
     src/boringssl/err_data.c \
     third_party/boringssl/crypto/aes/aes.c \
@@ -711,6 +713,7 @@
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/filters/load_reporting)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/filters/max_age)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/filters/message_size)
+  PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/filters/workarounds)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/transport/chttp2/alpn)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/transport/chttp2/client)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/transport/chttp2/client/insecure)