LuaJIT add lua 5.2 compatibility build option

srcpkgs/LuaJIT/template

@@ -13,6 +13,8 @@ homepage="http://www.luajit.org"
 distfiles="http://luajit.org/download/${pkgname}-${_dist_version}.tar.gz"
 checksum=1ad2e34b111c802f9d0cdf019e986909123237a28c746b21295b63c9e785d9c3
 
+build_options="lua52compat"
+
 _cross_cc="cc"
 if [ "$XBPS_WORDSIZE" != "$XBPS_TARGET_WORDSIZE" ]; then
 	if [ "${XBPS_MACHINE/-musl/}" = "x86_64" ]; then
@@ -48,10 +50,15 @@ do_build() {
 		local cross="CROSS=${XBPS_CROSS_TRIPLET}-"
 	fi
 
+	if [ "$build_option_lua52compat" ]; then
+		local _xcflags="XCFLAGS=-DLUAJIT_ENABLE_LUA52COMPAT"
+	fi
+
 	unset CFLAGS LDFLAGS
 	make ${makejobs} PREFIX=/usr HOST_LUA=lua5.2 HOST_CC="${_cross_cc}" \
 		HOST_CFLAGS="$XBPS_CFLAGS" HOST_LDFLAGS="$XBPS_LDFLAGS" \
-		TARGET_CFLAGS="${_cflags}" TARGET_LDFLAGS="${_ldflags}" ${cross}
+		TARGET_CFLAGS="${_cflags}" TARGET_LDFLAGS="${_ldflags}" \
+		${_xcflags} ${cross}
 }
 
 do_install() {