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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 c9a629547e..416292d0d1 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -12,7 +12,7 @@ CXX_EXT = %w[cc cxx cpp]
if /mswin|bccwin|mingw|msdosdjgpp|human|os2/ !~ CONFIG['build_os']
CXX_EXT.concat(%w[C])
end
-SRC_EXT = %w[c m] << CXX_EXT
+SRC_EXT = %w[c m].concat(CXX_EXT)
$static = $config_h = nil
$default_static = $static