games/openbor: unbreak with Clang 11

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at openborscript.c
>>>            openborscript.o:(.bss+0xD80)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at openborscript.c
>>>            openborscript.o:(.bss+0x4B0)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at control.c
>>>            sdl/control.o:(.bss+0x68)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at control.c
>>>            sdl/control.o:(.bss+0x70)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at menu.c
>>>            sdl/menu.o:(.bss+0x30)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at menu.c
>>>            sdl/menu.o:(.bss+0x38)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at translation.c
>>>            source/gamelib/translation.o:(.bss+0x18)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at translation.c
>>>            source/gamelib/translation.o:(.bss+0x20)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at models.c
>>>            source/gamelib/models.o:(.bss+0x408)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at models.c
>>>            source/gamelib/models.o:(.bss+0x410)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at utils.c
>>>            source/utils.o:(.bss+0x850)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at utils.c
>>>            source/utils.o:(.bss+0x858)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at animation.c
>>>            source/openborscript/animation.o:(.bss+0x0)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at animation.c
>>>            source/openborscript/animation.o:(.bss+0x8)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at axis.c
>>>            source/openborscript/axis.o:(.bss+0x0)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at axis.c
>>>            source/openborscript/axis.o:(.bss+0x8)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at binding.c
>>>            source/openborscript/binding.o:(.bss+0x0)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at binding.c
>>>            source/openborscript/binding.o:(.bss+0x8)

ld: error: duplicate symbol: anim_list
>>> defined at openbor.c
>>>            openbor.o:(anim_list)
>>> defined at drawmethod.c
>>>            source/openborscript/drawmethod.o:(.bss+0x0)

ld: error: duplicate symbol: model_cache
>>> defined at openbor.c
>>>            openbor.o:(model_cache)
>>> defined at drawmethod.c
>>>            source/openborscript/drawmethod.o:(.bss+0x8)

ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)

Reported by:	pkg-fallout

1 files changed, 1 insertions, 0 deletions

diff --git a/games/openbor/Makefile b/games/openbor/Makefile
index 28f6c16a183e..e0d7ebe43921 100644
--- a/games/openbor/Makefile
+++ b/games/openbor/Makefile
@@ -57,6 +57,7 @@ MAKE_ENV=	BUILD_LINUX=1 SDKPATH="${LOCALBASE}" \
 MAKE_ARGS=	CC="${CC}" LIBRARIES="${LOCALBASE}/lib" \
 		TARGET_ARCH=${ARCH:S/i386/x86/} ARCHFLAGS="" \
 		TARGET_FINAL='${TARGET}' BUILD_MMX="" ECHO="${ECHO}"
+CFLAGS+=	-fcommon # https://github.com/DCurrent/openbor/issues/206
 LDFLAGS+=	-Wl,--as-needed # ogg, pthread, zlib
 SUB_FILES=	pkg-message
 SUB_LIST=	PKGBASE=${PKGBASE}