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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 749e7a5c7c..cdb51e05c8 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -251,7 +251,7 @@ module MakeMakefile
OUTFLAG = CONFIG['OUTFLAG']
COUTFLAG = CONFIG['COUTFLAG']
- CPPOUTFILE = CONFIG['CPPOUTFILE'].sub(/\bconftest\b/, CONFTEST)
+ CPPOUTFILE = CONFIG['CPPOUTFILE'] ? CONFIG['CPPOUTFILE'].sub(/\bconftest\b/, CONFTEST) : nil
def rm_f(*files)
opt = (Hash === files.last ? [files.pop] : [])