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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 0c3b2cb513..3f88fe3f04 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2398,7 +2398,7 @@ site-install-rb: install-rb
$warnflags = config['warnflags'] unless $extmk
end
$CFLAGS = with_config("cflags", arg_config("CFLAGS", config["CFLAGS"])).dup
- $CXXFLAGS = with_config("cxxflags", arg_config("CXXFLAGS", config["CXXFLAGS"])).dup
+ $CXXFLAGS = (with_config("cxxflags", arg_config("CXXFLAGS", config["CXXFLAGS"]))||'').dup
$ARCH_FLAG = with_config("arch_flag", arg_config("ARCH_FLAG", config["ARCH_FLAG"])).dup
$CPPFLAGS = with_config("cppflags", arg_config("CPPFLAGS", config["CPPFLAGS"])).dup
$LDFLAGS = with_config("ldflags", arg_config("LDFLAGS", config["LDFLAGS"])).dup