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-rw-r--r--GNUmakefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/GNUmakefile b/GNUmakefile
index cee6042..3741db5 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -26,7 +26,7 @@ RUBY_ENGINE := $(shell $(RUBY) -e 'puts((RUBY_ENGINE rescue "ruby"))')
 
 isolate_libs := tmp/isolate/.$(RUBY_ENGINE)-$(RUBY_VERSION).libs
 MYLIBS = $(RUBYLIB):$(shell cat $(isolate_libs) 2>/dev/null || \
-                      (test -f $(isolate_libs) && \
+                      (test -f ./script/isolate_for_tests  && \
                        $(RUBY) ./script/isolate_for_tests >/dev/null && \
                        cat $(isolate_libs) 2>/dev/null))