Index: hacks.mk
===================================================================
RCS file: /cvsroot/pkgsrc/lang/perl5/hacks.mk,v
retrieving revision 1.16
diff -p -u -r1.16 hacks.mk
--- hacks.mk	17 May 2015 12:57:16 -0000	1.16
+++ hacks.mk	6 Aug 2015 22:04:41 -0000
@@ -74,4 +74,17 @@ LDFLAGS+=	${COMPILER_RPATH_FLAG}/usr/sfw
 .  endif
 .endif
 
+### [Thu Aug  6 14:43:56 PDT 2015 : mrg]
+### On NetBSD/{mips,vax,sparc64}, the -freorder-blocks option in -O2
+### causes opmini.c to be miscompiled, and perl build fails.
+###
+.if !empty(CC_VERSION:Mgcc-4.5.*) && ${OPSYS} == "NetBSD"
+.  if (${MACHINE_ARCH} == "vax" ||	\
+       ${MACHINE_CPU} == "mips" ||	\
+       ${MACHINE_ARCH} == "sparc64")
+PKG_HACKS+=	gcc-4.5-codegen
+CFLAGS+=	-fno-reorder-blocks
+.  endif
+.endif
+
 .endif  # PERL5_HACKS_MK