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-rw-r--r--n/avr/rs232/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/n/avr/rs232/Makefile b/n/avr/rs232/Makefile
index cb8523d..1c08c0b 100644
--- a/n/avr/rs232/Makefile
+++ b/n/avr/rs232/Makefile
@@ -46,7 +46,7 @@ doc: $(DOC)
aft $<
%.exd: $(EXTRACTDOC)
- extractdoc $^ > $@
+ test -n "$^" && extractdoc $^ > $@ || true
# Rules for building the .text rom images.