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-rw-r--r--lib/mkmf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 73866e229f..1fb0e6ca54 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -12,7 +12,7 @@ CXX_EXT = %w[cc cxx cpp]
if File::FNM_SYSCASE.zero?
CXX_EXT.concat(%w[C])
end
-SRC_EXT = %w[c m] << CXX_EXT
+SRC_EXT = %w[c m].concat(CXX_EXT)
$static = nil
$config_h = '$(arch_hdrdir)/ruby/config.h'
$default_static = $static