Bug fix to Remote Backups

install/openlitespeed/ax_check_liblua.m4

@@ -0,0 +1,39 @@
+#
+# AC_LIBLUA_CHECK
+#
+AC_DEFUN([AC_LIBLUA_CHECK],[
+
+    if test "x$lua_dir" != "x"
+    then
+        LUA_INCLUDES="$lua_dir"
+        save_CFLAGS="$CFLAGS"
+        CFLAGS="$CFLAGS -I$lua_dir"
+        save_CPPFLAGS="$CPPFLAGS"
+        CPPFLAGS="$CPPFLAGS -I$lua_dir"
+    else 
+        save_CFLAGS="$CFLAGS"
+        save_CPPFLAGS="$CPPFLAGS"
+    fi
+
+    AC_CHECK_HEADERS(lua.h lualib.h lauxlib.h,,
+    [
+        if test "x$lua_dir" != "x"
+        then
+            AC_MSG_ERROR([liblua header not found in directory specified in --with-lua])
+        else
+            if test "x$need_lua" = "xyes"
+            then
+                AC_MSG_ERROR(Header file lua.h not found.)
+            else
+                need_lua=no
+            fi
+        fi
+    ])
+
+    if test "x$need_lua" != "xno"
+    then
+        CFLAGS="$save_CFLAGS"
+        CPPFLAGS="$save_CPPFLAGS"
+        AC_SUBST(LUA_INCLUDES)
+    fi
+])