diff --git a/games/battletanks/Makefile b/games/battletanks/Makefile
index 76c29885973a..4efffebc9f31 100644
--- a/games/battletanks/Makefile
+++ b/games/battletanks/Makefile
@@ -1,58 +1,57 @@
 PORTNAME=	btanks
 PORTVERSION=	0.9.8083
 PORTREVISION=	11
 CATEGORIES=	games
 MASTER_SITES=	SF/${PORTNAME}/${PORTNAME}-source/
 
 MAINTAINER=	danfe@FreeBSD.org
 COMMENT=	Fast 2D tank arcade game with multiplayer and split-screen modes
 WWW=		https://btanks.sourceforge.net/
 
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	zip:archivers/zip
 LIB_DEPENDS=	libsigc-2.0.so:devel/libsigc++20 \
 		libexpat.so:textproc/expat2 \
 		libvorbisfile.so:audio/libvorbis \
 		libsmpeg.so:multimedia/smpeg
 
-USES=		lua:51 openal:al pkgconfig python:build scons sdl tar:bzip2
+USES=		lua openal:al pkgconfig python:build scons sdl tar:bzip2
 USE_CXXSTD=	gnu++98
 USE_LDCONFIG=	yes
 USE_SDL=	image sdl
 MAKE_ARGS=	prefix=${PREFIX} resources_dir=${DATADIR} \
 		--install-sandbox=${STAGEDIR}
-CXXFLAGS+=	-fpermissive
 
 PORTDOCS=	LICENSE LICENSE.EXCEPTION README-en.txt README-linux.txt \
 		donate.url homepage.url project_page.url video.txt
 
 DESKTOP_ENTRIES="Battle Tanks" "" "" "${PORTNAME}" "Game;ArcadeGame;" ""
 
 OPTIONS_DEFINE=	DOCS
 
 post-patch:
 	@${REINPLACE_CMD} -e '/for lua in/s/lua5\.1/lua-${LUA_VER}/ ; \
 		/^env.*ENABLE_LUA/d' ${WRKSRC}/engine/SConscript
 	@${REINPLACE_CMD} -e "s/env\.has_key('prefix')/'prefix' in env/" \
 		${WRKSRC}/mrt/SConscript
 # Prevent the clash with /usr/include/semaphore.h
 	@${MV} ${WRKSRC}/sdlx/semaphore.h ${WRKSRC}/sdlx/sdlx_semaphore.h
 	@${REINPLACE_CMD} -e 's/semaphore\.h"/sdlx_&/' \
 		${WRKSRC}/sdlx/semaphore.cpp ${WRKSRC}/sdlx/thread.h
 
 pre-build:
 # Regenerate `sl08.h' after we patch `sl08.py' (patching the header itself
 # would've resulted in a larger diff and gratuitous difference with Debian)
 	cd ${WRKSRC}/engine/sl08 && ${PYTHON_CMD} sl08.py > sl08.h
 
 post-install:
 	${INSTALL_MAN} ${FILESDIR}/${PORTNAME}.6 \
 		${STAGEDIR}${PREFIX}/share/man/man6
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${PORTDOCS:S,^,${WRKSRC}/,} ${STAGEDIR}${DOCSDIR}
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/* ${STAGEDIR}${PREFIX}/lib/*.so \
 		${STAGEDIR}${PREFIX}/lib/btanks/*.so
 
 .include <bsd.port.mk>
diff --git a/games/battletanks/files/patch-engine_luaxx_state.cpp b/games/battletanks/files/patch-engine_luaxx_state.cpp
new file mode 100644
index 000000000000..61fbb875aa15
--- /dev/null
+++ b/games/battletanks/files/patch-engine_luaxx_state.cpp
@@ -0,0 +1,24 @@
+--- engine/luaxx/state.cpp.orig	2008-06-08 09:02:39 UTC
++++ engine/luaxx/state.cpp
+@@ -59,7 +59,11 @@ static const char * chunk_reader(lua_State *L, void *d
+ void State::load(const std::string &fname, const mrt::Chunk &data) {
+ 	//throw_ex(("implement me[%s]", fname.c_str()));
+ 	reader_state x(data);
+-	int err = lua_load(state, chunk_reader, &x, fname.c_str());
++	int err = lua_load(state, chunk_reader, &x, fname.c_str()
++#if LUA_VERSION_NUM > 501
++	, NULL
++#endif
++	);
+ 	check_error(state, err);
+ }
+ 
+@@ -81,7 +85,7 @@ void State::init() {
+ 	assert(state == NULL);
+ 
+ 	//state = lua_newstate(l_alloc, this);
+-	state = lua_open();
++	state = luaL_newstate();
+ 	if (state == NULL)
+ 		throw_ex(("cannot create lua interpreter"));
+ 
diff --git a/games/battletanks/pkg-plist b/games/battletanks/pkg-plist
index a55a283266ee..ac607a3d55ba 100644
--- a/games/battletanks/pkg-plist
+++ b/games/battletanks/pkg-plist
@@ -1,9 +1,9 @@
 bin/btanks
 bin/bted
-share/man/man6/btanks.6.gz
 lib/btanks/libbt_objects.so
 lib/libbtanks_engine.so
 lib/libclunk.so
 lib/libmrt.so
 lib/libsdlx.so
 %%DATADIR%%/resources.dat
+share/man/man6/btanks.6.gz