build: fix make distcheck

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>

man/Makefile.am

@@ -144,9 +144,9 @@ HTML_DOCS 		= $(dist_man_MANS:%=%.html) $(man_MANS:%=%.html)
 	@echo Generating $@ man page && \
 	rm -f $@-t-t $@-t $@ && \
 	date="$$(LC_ALL=C date "+%F")" && \
-	awk "{print}(\$$1 ~ /@COMMONIPCERRORS@/){exit 0}" $@.in > $@-t-t && \
-	cat $(autogen_common) >> $@-t-t && \
-	awk -v p=0 "(\$$1 ~ /@COMMONIPCERRORS@/){p = 1} {if(p==1)print}" $@.in >> $@-t-t && \
+	awk "{print}(\$$1 ~ /@COMMONIPCERRORS@/){exit 0}" ${top_srcdir}/man/$@.in > $@-t-t && \
+	cat ${top_srcdir}/man/$(autogen_common) >> $@-t-t && \
+	awk -v p=0 "(\$$1 ~ /@COMMONIPCERRORS@/){p = 1} {if(p==1)print}" ${top_srcdir}/man/$@.in >> $@-t-t && \
 	cat $@-t-t | \
 		sed -e 's#@BUILDDATE@#'$$date'#g' \
 		    -e 's#@COMMONIPCERRORS@##g' \