$OpenBSD: patch-libffi_ghc_mk,v 1.1 2012/10/11 07:51:10 dcoppa Exp $

Unbreak the build on OpenBSD/amd64: undefined references to
'ffi_call_unix64', 'ffi_closure_unix64'

gcc supports @unwind sections while ld (binutils 2.15) does not

--- libffi/ghc.mk.orig	Wed Jun  6 19:10:25 2012
+++ libffi/ghc.mk	Wed Oct 10 11:25:30 2012
@@ -78,6 +78,7 @@ $(libffi_STAMP_CONFIGURE): $(TOUCH_DEP)
 	    NM=$(NM) \
         CFLAGS="$(SRC_CC_OPTS) $(CONF_CC_OPTS_STAGE1) -w" \
         LDFLAGS="$(SRC_LD_OPTS) $(CONF_GCC_LINKER_OPTS_STAGE1) -w" \
+        libffi_cv_as_x86_64_unwind_section_type=no \
         "$(SHELL)" configure \
 	          --prefix=$(TOP)/libffi/build/inst \
 	          --enable-static=yes \