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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 c5d9b194e3..b9f04c4f20 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1335,7 +1335,7 @@ site-install-rb: install-rb
end
mfile.print "\n\n"
if makedef
- mfile.print "$(DEFFILE): #{origdef}\n"
+ mfile.print "$(DEFFILE): #{origdef || ''}\n"
mfile.print "\t$(RUBY) #{makedef} #{origdef} > $@\n\n"
end