--- ./configure.ac.ORIGIN	2021-01-14 21:20:14 +0100
+++ ./configure.ac	2021-01-14 21:17:27 +0100
@@ -2342,7 +2342,7 @@
   else
     LUA_OK="1"
     CFLAGS_SAVED=$CFLAGS
-    CFLAGS= # Use empty CFLAGS to avoid failure: "present but cannot be compiled"
+#    CFLAGS= # Use empty CFLAGS to avoid failure: "present but cannot be compiled"
     AC_CHECK_HEADER([lua.h],[LUAFLAGS=""],[LUA_OK=""])
     CFLAGS=$CFLAGS_SAVED
     # if we didn't get it, going to have to look elsewhere (the hard way)