Temporary header file '/tmp/7jtjYdxARa/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/evhtp/config.h"
  #include "/usr/include/evhtp/evhtp.h"
  #include "/usr/include/evhtp/log.h"
  #include "/usr/include/evhtp/parser.h"
  #include "/usr/include/evhtp/sslutils.h"
  #include "/usr/include/evhtp/sys/tree.h"
  #include "/usr/include/evhtp/thread.h"
  #include "/usr/include/evhtp.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/7jtjYdxARa/dump1.h"

In file included from /usr/include/evhtp/evhtp.h:12,
                 from /tmp/7jtjYdxARa/dump1.h:13:
/usr/include/evhtp/thread.h:9:10: fatal error: event2/event.h: No such file or directory
    9 | #include <event2/event.h>
      |          ^~~~~~~~~~~~~~~~
compilation terminated.