--- man/Makefile.in.orig	2014-03-04 03:36:13.000000000 +0800
+++ man/Makefile.in	2014-03-06 04:17:01.801977380 +0800
@@ -885,7 +885,7 @@
 
 
 $(MANS_CPP): $(MANS_CPP:%=%.pre)
-	$(CPP) -nostdinc -w -C -P -I$(top_srcdir)/man $@.pre  $@
+	$(CPP) -nostdinc -w -C -I$(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.