diff -up isdn4k-utils-3.27_20151118/ipppd/Makefile.in.than isdn4k-utils-3.27_20151118/ipppd/Makefile.in
--- isdn4k-utils-3.27_20151118/ipppd/Makefile.in.than	2015-11-18 22:33:13.351145388 +0100
+++ isdn4k-utils-3.27_20151118/ipppd/Makefile.in	2015-11-18 22:33:24.649039181 +0100
@@ -73,7 +73,7 @@ endif
 
 DEBUG_FLAGS   = @CONFIG_IPPPD_DEBUGFLAGS@
 COMPILE_FLAGS = @CFLAGS@
-CFLAGS        = $(RPM_OPT_FLAGS) -DREQ_SYSOPTIONS=0
+CFLAGS        = $(RPM_OPT_FLAGS) -DREQ_SYSOPTIONS=0 -fno-strict-aliasing
 VER           = 2.2.0
 
 # it's a hack
diff -up isdn4k-utils-3.27_20151118/rcapid/Makefile.am.than isdn4k-utils-3.27_20151118/rcapid/Makefile.am
--- isdn4k-utils-3.27_20151118/rcapid/Makefile.am.than	2015-11-18 22:34:20.527513865 +0100
+++ isdn4k-utils-3.27_20151118/rcapid/Makefile.am	2015-11-18 22:34:36.784361034 +0100
@@ -8,7 +8,7 @@ MAINTAINERCLEANFILES    = configure aclo
 			  stamp-h.in comperr
 
 INCLUDES = -I../capi20 $(all_includes)
-CFLAGS = -Wall $(RPM_OPT_FLAGS)
+CFLAGS = -Wall $(RPM_OPT_FLAGS) -fno-strict-aliasing
 LDFLAGS = -L../capi20/.libs -L../capi20 $(all_libraries)
 LDADD = -lcapi20
 
diff -up isdn4k-utils-3.27_20151118/rcapid/Makefile.in.than isdn4k-utils-3.27_20151118/rcapid/Makefile.in
diff -up isdn4k-utils-3.27_20151118/vbox/Makefile.in.than isdn4k-utils-3.27_20151118/vbox/Makefile.in