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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 4365cbe579..5afe5017d1 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1102,7 +1102,7 @@ static: $(STATIC_LIB)#{$extout ? " install-rb" : ""}
mfile.print CLEANINGS
dirs = []
mfile.print "install: install-so install-rb\n\n"
- sodir = dir = "$(RUBYARCHDIR)"
+ sodir = (dir = "$(RUBYARCHDIR)").dup
mfile.print("install-so: #{dir}\n")
if target
f = "$(DLLIB)"