--- man/Makefile.in.orig	2018-02-02 22:15:32 UTC
+++ man/Makefile.in
@@ -989,7 +989,7 @@ uninstall-man: uninstall-man3 uninstall-
 
 
 $(MANS_CPP): $(MANS_CPP:%=%.pre)
-	$(CPP_FOR_BUILD) -nostdinc -w -C -P -I$(top_srcdir)/man $@.pre $@
+	$(CPP_FOR_BUILD) -nostdinc -w -C -I$(top_srcdir)/man $@.pre | grep -v '^#' > $@
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.