--- ncurses/Makefile.in.orig	2015-01-21 13:27:02.427199242 +0100
+++ ncurses/Makefile.in	2015-01-21 13:27:11.946311063 +0100
@@ -219,7 +219,7 @@
 	sh -e $(srcdir)/run_cmd.sh $(tinfo)/MKfallback.sh $(TERMINFO) $(TERMINFO_SRC) $(TIC_PATH) $(FALLBACK_LIST) >$@
 
 ./lib_gen.c : $(base)/MKlib_gen.sh ../include/curses.h
-	sh -e $(base)/MKlib_gen.sh "$(CPP) $(CPPFLAGS)" "$(AWK)" generated <../include/curses.h >$@
+	sh -e $(base)/MKlib_gen.sh "$(CPP) $(CPPFLAGS) -P" "$(AWK)" generated <../include/curses.h >$@
 
 init_keytry.h: make_keys$(BUILD_EXEEXT) keys.list
 	./make_keys$(BUILD_EXEEXT) keys.list > $@