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-rw-r--r--ruby/ext/google/protobuf_c/extconf.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/ruby/ext/google/protobuf_c/extconf.rb b/ruby/ext/google/protobuf_c/extconf.rb
index 0886e607..cc097e11 100644
--- a/ruby/ext/google/protobuf_c/extconf.rb
+++ b/ruby/ext/google/protobuf_c/extconf.rb
@@ -2,7 +2,9 @@
require 'mkmf'
-$CFLAGS += " -std=c99 -O3 -DNDEBUG"
+unless RUBY_PLATFORM =~ /mswin|mingw/
+ $CFLAGS += " -std=c99 -O3 -DNDEBUG"
+end
if RUBY_PLATFORM =~ /linux/