Temporary header file '/tmp/9Hitm2dqjp/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/apache2/apreq2/apreq_module_apache2.h"
  #include "/usr/include/apreq2/apreq.h"
  #include "/usr/include/apreq2/apreq_cookie.h"
  #include "/usr/include/apreq2/apreq_error.h"
  #include "/usr/include/apreq2/apreq_module.h"
  #include "/usr/include/apreq2/apreq_param.h"
  #include "/usr/include/apreq2/apreq_parser.h"
  #include "/usr/include/apreq2/apreq_util.h"
  #include "/usr/include/apreq2/apreq_version.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/9Hitm2dqjp/dump1.h"  -I/usr/include/apreq2 -I/usr/include/apr-1.0

In file included from /usr/include/apreq2/apreq_parser.h:22,
                 from /usr/include/apreq2/apreq_module.h:22,
                 from /usr/include/apache2/apreq2/apreq_module_apache2.h:21,
                 from /tmp/9Hitm2dqjp/dump1.h:12:
/usr/include/apreq2/apreq_param.h:22:10: fatal error: apr_buckets.h: No such file or directory
   22 | #include "apr_buckets.h"
      |          ^~~~~~~~~~~~~~~
compilation terminated.