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-rw-r--r--src/Makefile.am2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index 5ad32ba..ea65852 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -61,7 +61,7 @@ twm_SOURCES = \
lex.l
BUILT_SOURCES = gram.h gram.c lex.c deftwmrc.c
-CLEANFILES = $(BUILT_SOURCES)
+MAINTAINERCLEANFILES = $(BUILT_SOURCES)
gram.h: gram.c