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-rw-r--r--src/ruby/ext/grpc/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ruby/ext/grpc/extconf.rb b/src/ruby/ext/grpc/extconf.rb
index 426a6e67a0..dabb78b562 100644
--- a/src/ruby/ext/grpc/extconf.rb
+++ b/src/ruby/ext/grpc/extconf.rb
@@ -76,6 +76,7 @@ unless File.exist?(File.join(grpc_lib_dir, 'libgrpc.a')) or windows
ENV['EMBED_OPENSSL'] = 'true'
ENV['EMBED_ZLIB'] = 'true'
ENV['ARCH_FLAGS'] = '-arch i386 -arch x86_64' if RUBY_PLATFORM =~ /darwin/
+ ENV['CFLAGS'] = '-DGPR_BACKWARDS_COMPATIBILITY_MODE'
output_dir = File.expand_path(RbConfig::CONFIG['topdir'])
grpc_lib_dir = File.join(output_dir, 'libs', grpc_config)