diff -Nrux .svn -x work /usr/ports/devel/libexecinfo/Makefile libexecinfo/Makefile
--- /usr/ports/devel/libexecinfo/Makefile	2006-06-29 06:21:47.000000000 -0700
+++ libexecinfo/Makefile	2008-08-21 20:00:14.707413640 -0700
@@ -20,6 +20,12 @@
 MAKE_FLAGS=	LIBDIR=${PREFIX}/lib \
 		INCLUDEDIR=${PREFIX}/include
 
+.include <bsd.port.pre.mk>
+
+.if ${ARCH} == "amd64"
+CFLAGS+=	-fno-omit-frame-pointer
+.endif
+
 PORTDOCS=	README
 
 post-install:
@@ -28,4 +34,4 @@
 	${INSTALL_DATA} ${WRKSRC}/README ${DOCSDIR}
 .endif
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>