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diff --git a/editors/emacs24/hacks.mk b/editors/emacs24/hacks.mk
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+# $NetBSD: hacks.mk,v 1.1 2016/04/04 13:39:08 ryoon Exp $
+
+.if !defined(EMACS_HACKS_MK)
+EMACS_HACKS_MK= defined
+
+.include "../../mk/compiler.mk"
+
+### On NetBSD/amd64 7.99.26, gcc optimisation, at least for version 5.3,
+### produces, a "temacs" binary which segfaults.
+###
+. if !empty(MACHINE_PLATFORM:MNetBSD-*-x86_64)
+. if !empty(CC_VERSION:Mgcc-5.3.*)
+PKG_HACKS+= optimisation
+BUILDLINK_TRANSFORM+= opt:-O2:-O0
+. endif
+. endif
+
+.endif # EMACS_HACKS_MK