Fedora-specific makefile patch.

--- iputils-s20121205/Makefile.orig	2012-12-05 15:46:14.000000000 +0100
+++ iputils-s20121205/Makefile	2012-12-06 11:38:14.752414482 +0100
@@ -46,7 +46,7 @@
 # -------------------------------------
 # What a pity, all new gccs are buggy and -Werror does not work. Sigh.
 # CCOPT=-fno-strict-aliasing -Wstrict-prototypes -Wall -Werror -g
-CCOPT=-fno-strict-aliasing -Wstrict-prototypes -Wall -g
+CCOPT=-fno-strict-aliasing -Wstrict-prototypes -Wall -g -Werror
 CCOPTOPT=-O3
 GLIBCFIX=-D_GNU_SOURCE
 DEFINES=
@@ -73,7 +73,7 @@
 endif
 
 # USE_IDN: DEF_IDN, LIB_IDN
-ifneq ($(USE_IDN),no)
+ifneq ($(USE_IDN),yes)
 	DEF_IDN = -DUSE_IDN
 	LIB_IDN = $(call FUNC_LIB,$(USE_IDN),$(LDFLAG_IDN))
 endif
@@ -101,7 +101,7 @@
 IPV6_TARGETS=tracepath6 traceroute6 ping6
 TARGETS=$(IPV4_TARGETS) $(IPV6_TARGETS)
 
-CFLAGS=$(CCOPTOPT) $(CCOPT) $(GLIBCFIX) $(DEFINES)
+CFLAGS+=$(RPM_OPT_FLAGS) $(CCOPTOPT) $(CCOPT) $(GLIBCFIX) $(DEFINES)
 LDLIBS=$(LDLIB) $(ADDLIB)
 
 UNAME_N:=$(shell uname -n)
@@ -178,6 +178,7 @@
 
 # -------------------------------------
 # ninfod
+ninfod: CFLAGS:=$(filter-out -Werror,$(CFLAGS))
 ninfod:
 	@set -e; \
 		if [ ! -f ninfod/Makefile ]; then \