Temporary header file '/tmp/KynGrMnxMh/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/cabvars.h"
  #include "/usr/include/cspmatrix.h"
  #include "/usr/include/cspredef.h"
  #include "/usr/include/hoc.h"
  #include "/usr/include/hoc_membf.h"
  #include "/usr/include/hocassrt.h"
  #include "/usr/include/hocdec.h"
  #include "/usr/include/hocgetsym.h"
  #include "/usr/include/hoclist.h"
  #include "/usr/include/hocparse.h"
  #include "/usr/include/isoc99.h"
  #include "/usr/include/mcran4.h"
  #include "/usr/include/md1redef.h"
  #include "/usr/include/md2redef.h"
  #include "/usr/include/mech_api.h"
  #include "/usr/include/membdef.h"
  #include "/usr/include/membfunc.h"
  #include "/usr/include/multicore.h"
  #include "/usr/include/multisplit.h"
  #include "/usr/include/neuron.h"
  #include "/usr/include/newton_struct.h"
  #include "/usr/include/nmodlmutex.h"
  #include "/usr/include/nrn_ansi.h"
  #include "/usr/include/nrnapi.h"
  #include "/usr/include/nrnassrt.h"
  #include "/usr/include/nrnconf.h"
  #include "/usr/include/nrncvode/nrnneosm.h"
  #include "/usr/include/nrncvode.h"
  #include "/usr/include/nrnisaac.h"
  #include "/usr/include/nrniv_mf.h"
  #include "/usr/include/nrnmpi.h"
  #include "/usr/include/nrnmpidec.h"
  #include "/usr/include/nrnmpiuse.h"
  #include "/usr/include/nrnoc_ml.h"
  #include "/usr/include/nrnpthread.h"
  #include "/usr/include/nrnpy_hoc.h"
  #include "/usr/include/nrnran123.h"
  #include "/usr/include/nrnrandom.h"
  #include "/usr/include/nrnredef.h"
  #include "/usr/include/nrnsemanticversion.h"
  #include "/usr/include/nrnversionmacros.h"
  #include "/usr/include/oc_ansi.h"
  #include "/usr/include/ocfunc.h"
  #include "/usr/include/ocmisc.h"
  #include "/usr/include/options.h"
  #include "/usr/include/scoplib.h"
  #include "/usr/include/section.h"
  #include "/usr/include/spconfig.h"
  #include "/usr/include/spmatrix.h"

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

In file included from /tmp/KynGrMnxMh/dump1.h:15:
/usr/include/hoc.h:4:10: fatal error: redef.h: No such file or directory
    4 | #include "redef.h"
      |          ^~~~~~~~~
compilation terminated.