Temporary header file '/tmp/snxBDCBL26/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/lua5.1/lua-curl.h"
  #include "/usr/include/lua5.2/lua-curl.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/snxBDCBL26/dump1.h"

In file included from /tmp/snxBDCBL26/dump1.h:12:
/usr/include/lua5.1/lua-curl.h:4:36: error: ‘lua_State’ was not declared in this scope
    4 | int luacurl_freepops_open_and_init(lua_State* L);
      |                                    ^~~~~~~~~
/usr/include/lua5.1/lua-curl.h:4:47: error: ‘L’ was not declared in this scope
    4 | int luacurl_freepops_open_and_init(lua_State* L);
      |                                               ^
/usr/include/lua5.1/lua-curl.h:5:27: error: ‘lua_State’ was not declared in this scope
    5 | int luacurl_freepops_open(lua_State* L);
      |                           ^~~~~~~~~
/usr/include/lua5.1/lua-curl.h:5:38: error: ‘L’ was not declared in this scope
    5 | int luacurl_freepops_open(lua_State* L);
      |                                      ^
/usr/include/lua5.1/lua-curl.h:8:18: error: ‘lua_State’ was not declared in this scope
    8 | int luaopen_curl(lua_State* L);
      |                  ^~~~~~~~~
/usr/include/lua5.1/lua-curl.h:8:29: error: ‘L’ was not declared in this scope
    8 | int luaopen_curl(lua_State* L);
      |                             ^