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-rw-r--r--build_config/ci/gcc-clang.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/build_config/ci/gcc-clang.rb b/build_config/ci/gcc-clang.rb
index eb4331e65..eeaab5d0f 100644
--- a/build_config/ci/gcc-clang.rb
+++ b/build_config/ci/gcc-clang.rb
@@ -28,7 +28,7 @@ MRuby::Build.new('cxx_abi') do |conf|
conf.toolchain
conf.gembox 'full-core'
- conf.cc.flags += %w(-fpermissive)
+ conf.cc.flags += %w(-fpermissive -std=gnu++03)
conf.compilers.each do |c|
c.defines += %w(MRB_GC_FIXED_ARENA MRB_UTF8_STRING)
end