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-rw-r--r--ext/monitor/depend1
1 files changed, 0 insertions, 1 deletions
diff --git a/ext/monitor/depend b/ext/monitor/depend
index 44b5616a61..6616bd2f32 100644
--- a/ext/monitor/depend
+++ b/ext/monitor/depend
@@ -146,7 +146,6 @@ monitor.o: $(hdrdir)/ruby/backward.h
monitor.o: $(hdrdir)/ruby/backward/2/assume.h
monitor.o: $(hdrdir)/ruby/backward/2/attributes.h
monitor.o: $(hdrdir)/ruby/backward/2/bool.h
-monitor.o: $(hdrdir)/ruby/backward/2/extern.h
monitor.o: $(hdrdir)/ruby/backward/2/gcc_version_since.h
monitor.o: $(hdrdir)/ruby/backward/2/inttypes.h
monitor.o: $(hdrdir)/ruby/backward/2/limits.h