fix build on !clang archs

games/fs2open/Makefile

@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.3 2018/03/02 06:59:06 kirby Exp $
+# $OpenBSD: Makefile,v 1.4 2018/05/29 07:32:31 kirby Exp $
 
 COMMENT =	open source game engine based on FreeSpace 2
 
@@ -28,6 +28,8 @@ MASTER_SITES =	https://github.com/scp-fs2open/fs2open.github.com/releases/downlo
 # Remove on next update
 DISTFILES = ${DISTNAME}_1{${DISTNAME}}${EXTRACT_SUFX}
 
+# c++11
+COMPILER =		base-clang ports-gcc
 MODULES =		devel/cmake \
 			lang/lua
 LIB_DEPENDS =		audio/openal \

games/fs2open/patches/patch-cmake_platformChecks_cmake

@@ -0,0 +1,14 @@
+$OpenBSD: patch-cmake_platformChecks_cmake,v 1.1 2018/05/29 07:32:31 kirby Exp $
+
+Index: cmake/platformChecks.cmake
+--- cmake/platformChecks.cmake.orig
++++ cmake/platformChecks.cmake
+@@ -10,7 +10,7 @@ include(CheckSymbolExists)
+ include(CheckCXXSymbolExists)
+ include(CheckTypeSize)
+ 
+-CHECK_INCLUDE_FILE("execinfo.h" HAVE_EXECINFO_H)
++#CHECK_INCLUDE_FILE("execinfo.h" HAVE_EXECINFO_H)
+ CHECK_INCLUDE_FILE_CXX("cxxabi.h" HAVE_CXXAPI_H)
+ 
+ CHECK_TYPE_SIZE("max_align_t" MAX_ALIGN_T)