From f9931f0499c3e12bab6e371d21decb89d9e4df18 Mon Sep 17 00:00:00 2001
From: John Marino <draco@marino.st>
Date: Mon, 16 Feb 2015 15:38:24 +0100
Subject: [PATCH] unbreak world, take 2

The previous style works in the world makefiles but not here.
Try to fix the unbreak by checking if .MAKE.BUILT.BY is defined before
attempting to use it.
---
 share/mk/sys.mk | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/share/mk/sys.mk b/share/mk/sys.mk
index 011fadb642..39968792e7 100644
--- a/share/mk/sys.mk
+++ b/share/mk/sys.mk
@@ -60,10 +60,8 @@ CXX_LINK	?=	${CXX}
 NXCXX		?=	${NXENV} ${CXX}
 NXCXX_LINK	?=	${NXENV} ${CXX_LINK}
 CXXFLAGS	?=	${CXXINCLUDES} ${CFLAGS:N-std=*:N-Wnested-externs:N-W*-prototypes:N-Wno-pointer-sign:N-Wold-style-definition}
-.if !defined(SYSBUILD)
-. if ${.MAKE.BUILT.BY:Mgcc47}
+.if !defined(SYSBUILD) && defined(.MAKE.BUILT.BY) && ${.MAKE.BUILT.BY:Mgcc47}
 CXXFLAGS	+=	-D_GLIBCXX_USE_CXX11_ABI=0
-. endif
 .endif
 
 CPP		?=	cpp
-- 
2.41.0