--- protobuf-3.7.0/ruby/ext/google/protobuf_c/extconf.rb	2019-03-12 12:41:06.025000000 +0100
+++ protobuf-3.7.0/ruby/ext/google/protobuf_c/extconf.rb	2019-03-12 12:42:04.062000000 +0100
@@ -5,19 +5,12 @@
 if RUBY_PLATFORM =~ /darwin/ || RUBY_PLATFORM =~ /linux/
   # XOPEN_SOURCE needed for strptime:
   # https://stackoverflow.com/questions/35234152/strptime-giving-implicit-declaration-and-undefined-reference
-  $CFLAGS += " -std=c99 -O3 -DNDEBUG -D_XOPEN_SOURCE=700"
+  $CFLAGS += " -std=c99 -DNDEBUG -D_XOPEN_SOURCE=700"
 else
-  $CFLAGS += " -std=c99 -O3 -DNDEBUG"
-end
-
-
-if RUBY_PLATFORM =~ /linux/
-  # Instruct the linker to point memcpy calls at our __wrap_memcpy wrapper.
-  $LDFLAGS += " -Wl,-wrap,memcpy"
+  $CFLAGS += " -std=c99 -DNDEBUG"
 end
 
 $objs = ["protobuf.o", "defs.o", "storage.o", "message.o",
-         "repeated_field.o", "map.o", "encode_decode.o", "upb.o",
-         "wrap_memcpy.o"]
+         "repeated_field.o", "map.o", "encode_decode.o", "upb.o" ]
 
 create_makefile("google/protobuf_c")