* Package:    dev-ml/lwt-3.1.0
 * Repository: gentoo
 * Maintainer: ml@gentoo.org
 * USE:        abi_x86_64 amd64 camlp4 elibc_glibc kernel_linux libev userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking lwt-3.1.0.tar.gz to /var/tmp/portage/dev-ml/lwt-3.1.0/work
>>> Source unpacked in /var/tmp/portage/dev-ml/lwt-3.1.0/work
>>> Preparing source in /var/tmp/portage/dev-ml/lwt-3.1.0/work/lwt-3.1.0 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-ml/lwt-3.1.0/work/lwt-3.1.0 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-ml/lwt-3.1.0/work/lwt-3.1.0 ...
File "src/unix/jbuild", line 33, characters 0-81:
Warning: File lwt_config is both generated by a rule and present in the source tree.
As a result, the rule is currently ignored, however this will become an error in the future.
To keep the current behavior and get rid of this warning, add a field (fallback) to the rule.
    ocamllex src/logger/lwt_log_rules.ml
    ocamldep src/logger/lwt_log.dependsi.ocamldep-output
    ocamldep src/core/lwt.dependsi.ocamldep-output
    ocamldep src/preemptive/lwt_preemptive.depends.ocamldep-output
    ocamldep src/preemptive/lwt_preemptive.dependsi.ocamldep-output
    ocamldep src/simple_top/lwt_simple_top.depends.ocamldep-output
    ocamldep src/core/lwt.depends.ocamldep-output
   camlp4oof src/camlp4/log/pa_lwt_log.pp.ml
   camlp4oof src/camlp4/log/pa_lwt_log.pp.mli
    ocamldep src/camlp4/options/lwt_syntax_options.depends.ocamldep-output
   camlp4oof src/camlp4/pa_lwt.pp.ml
   camlp4oof src/camlp4/pa_lwt.pp.mli
      ocamlc src/unix/ocamlc_config
    ocamldep src/unix/config/discover.depends.ocamldep-output
    ocamldep src/unix/stubs/gen_stubs.depends.ocamldep-output
        cppo src/unix/lwt_unix.mli
    ocamldep src/logger/lwt_log.depends.ocamldep-output
      ocamlc src/core/lwt_pqueue.{cmi,cmti}
        cppo src/unix/lwt_unix.ml
      ocamlc src/core/lwt_sequence.{cmi,cmti}
    ocamldep src/camlp4/log/lwt_syntax_log.depends.ocamldep-output
    ocamldep src/camlp4/log/lwt_syntax_log.dependsi.ocamldep-output
    ocamldep src/camlp4/lwt_syntax.depends.ocamldep-output
    ocamldep src/camlp4/lwt_syntax.dependsi.ocamldep-output
      ocamlc src/unix/config/discover.{cmi,cmo,cmt}
      ocamlc src/camlp4/options/pa_lwt_options.{cmi,cmo,cmt}
    ocamldep src/unix/lwt_unix.dependsi.ocamldep-output
      ocamlc src/core/lwt_pqueue.{cmo,cmt}
      ocamlc src/core/lwt_sequence.{cmo,cmt}
      ocamlc src/unix/stubs/gen_stubs.{cmi,cmo,cmt}
    ocamlopt src/core/lwt_pqueue.{cmx,o}
      ocamlc src/core/lwt.{cmi,cmti}
    ocamlopt src/core/lwt_sequence.{cmx,o}
      ocamlc src/camlp4/options/lwt_syntax_options.cma
      ocamlc src/camlp4/log/pa_lwt_log.{cmi,cmti}
      ocamlc src/camlp4/pa_lwt.{cmi,cmti}
    ocamlopt src/camlp4/options/pa_lwt_options.{cmx,o}
File "_none_", line 1:
Warning 58: no cmx file was found in path for module Camlp4, and its interface was not compiled with -opaque
    ocamlopt src/unix/config/discover.{cmx,o}
      ocamlc src/core/lwt_list.{cmi,cmti}
      ocamlc src/core/lwt_mutex.{cmi,cmti}
      ocamlc src/core/lwt_mvar.{cmi,cmti}
      ocamlc src/core/lwt_pool.{cmi,cmti}
      ocamlc src/core/lwt_result.{cmi,cmti}
    ocamlopt .ppx/ppx_tools_versioned.metaquot_404/ppx.exe
      ocamlc src/core/lwt_stream.{cmi,cmti}
      ocamlc src/core/lwt_switch.{cmi,cmti}
    ocamlopt src/unix/stubs/gen_stubs.{cmx,o}
      ocamlc src/core/lwt.{cmo,cmt}
    ocamlopt src/camlp4/options/lwt_syntax_options.{a,cmxa}
      ocamlc src/camlp4/log/pa_lwt_log.{cmo,cmt}
    ocamlopt src/core/lwt.{cmx,o}
    ocamlopt src/camlp4/log/pa_lwt_log.{cmx,o}
      ocamlc src/core/lwt_list.{cmo,cmt}
      ocamlc src/camlp4/pa_lwt.{cmo,cmt}
      ocamlc src/core/lwt_mutex.{cmo,cmt}
      ocamlc src/core/lwt_condition.{cmi,cmti}
      ocamlc src/core/lwt_mvar.{cmo,cmt}
      ocamlc src/core/lwt_pool.{cmo,cmt}
      ocamlc src/core/lwt_result.{cmo,cmt}
         ppx src/ppx/ppx_lwt.pp.mli
         ppx src/ppx/ppx_lwt.pp.ml
      ocamlc src/core/lwt_switch.{cmo,cmt}
    ocamlopt src/unix/config/discover.exe
      ocamlc src/core/lwt_stream.{cmo,cmt}
      ocamlc src/camlp4/log/lwt_syntax_log.cma
    ocamlopt src/camlp4/options/lwt_syntax_options.cmxs
    ocamlopt src/camlp4/pa_lwt.{cmx,o}
File "_none_", line 1:
Warning 58: no cmx file was found in path for module Camlp4, and its interface was not compiled with -opaque
    ocamlopt src/core/lwt_result.{cmx,o}
    ocamlopt src/core/lwt_list.{cmx,o}
    ocamlopt src/core/lwt_switch.{cmx,o}
    ocamlopt src/core/lwt_mutex.{cmx,o}
    ocamlopt src/unix/stubs/gen_stubs.exe
    ocamlopt src/core/lwt_mvar.{cmx,o}
      ocamlc src/camlp4/lwt_syntax.cma
    ocamlopt src/core/lwt_pool.{cmx,o}
      ocamlc src/core/lwt_condition.{cmo,cmt}
    ocamlopt src/camlp4/log/lwt_syntax_log.{a,cmxa}
    ocamldep src/ppx/ppx_lwt.dependsi.ocamldep-output
    ocamlopt src/core/lwt_stream.{cmx,o}
      ocamlc src/logger/lwt_log_core.{cmi,cmti}
      ocamlc src/logger/lwt_log_rules.{cmi,cmti}
    ocamldep src/ppx/ppx_lwt.depends.ocamldep-output
    ocamlopt src/camlp4/lwt_syntax.{a,cmxa}
   gen_stubs src/unix/lwt_unix_job_access.c,src/unix/lwt_unix_job_chdir.c,src/unix/lwt_unix_job_chmod.c,src/unix/lwt_unix_job_chown.c,src/unix/lwt_unix_job_chroot.c,src/unix/lwt_unix_job_close.c,src/unix/lwt_unix_job_fchmod.c,src/unix/lwt_unix_job_fchown.c,src/unix/lwt_unix_job_fdatasync.c,src/unix/lwt_unix_job_fsync.c,src/unix/lwt_unix_job_ftruncate.c,src/unix/lwt_unix_job_link.c,src/unix/lwt_unix_job_lseek.c,src/unix/lwt_unix_job_mkdir.c,src/unix/lwt_unix_job_mkfifo.c,src/unix/lwt_unix_job_rename.c,src/unix/lwt_unix_job_rmdir.c,src/unix/lwt_unix_job_symlink.c,src/unix/lwt_unix_job_tcdrain.c,src/unix/lwt_unix_job_tcflow.c,src/unix/lwt_unix_job_tcflush.c,src/unix/lwt_unix_job_tcsendbreak.c,src/unix/lwt_unix_job_truncate.c,src/unix/lwt_unix_job_unlink.c,src/unix/lwt_unix_jobs_generated.ml
      ocamlc src/core/lwt.cma
    ocamlopt src/core/lwt_condition.{cmx,o}
      ocamlc src/logger/lwt_log_rules.{cmo,cmt}
      ocamlc src/ppx/ppx_lwt.{cmi,cmti}
    ocamlopt src/camlp4/log/lwt_syntax_log.cmxs
      ocamlc src/unix/lwt_gc.{cmi,cmti}
      ocamlc src/unix/lwt_engine.{cmi,cmti}
      ocamlc src/unix/lwt_main.{cmi,cmti}
      ocamlc src/unix/lwt_sys.{cmi,cmti}
      ocamlc src/unix/lwt_throttle.{cmi,cmti}
      ocamlc src/unix/lwt_timeout.{cmi,cmti}
      ocamlc src/unix/lwt_unix.{cmi,cmti}
      ocamlc src/logger/lwt_log_core.{cmo,cmt}
    ocamlopt src/camlp4/lwt_syntax.cmxs
    discover src/unix/lwt_config.{h,ml},src/unix/unix_c_flags.sexp,src/unix/unix_c_library_flags.sexp (exit 1)
(cd _build/default/src/unix && ./config/discover.exe -ocamlc-config ocamlc_config -lwt-config lwt_config)
found config var ext_obj: ...................... .o
found config var default_executable_name: ...... a.out
found config var ccomp_type: ................... cc
found config var system: ....................... linux
found config var os_type: ...................... Unix
found config var use_libev: .................... true
testing for pkg-config: ........................ available

Error: failed to compile a trivial ocaml toplevel.
You may be missing core components (compiler, ncurses, etc)

Run with DEBUG=y for more details.
      
 * ERROR: dev-ml/lwt-3.1.0::gentoo failed (compile phase):
 *   (no error message)
 * 
 * Call stack:
 *     ebuild.sh, line 125:  Called src_compile
 *   environment, line 221:  Called die
 * The specific snippet of code:
 *       jbuilder build -p lwt || die;
 * 
 * If you need support, post the output of `emerge --info '=dev-ml/lwt-3.1.0::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-ml/lwt-3.1.0::gentoo'`.
 * The complete build log is located at '/var/log/portage/dev-ml:lwt-3.1.0:20190717-142035.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-ml/lwt-3.1.0/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-ml/lwt-3.1.0/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-ml/lwt-3.1.0/work/lwt-3.1.0'
 * S: '/var/tmp/portage/dev-ml/lwt-3.1.0/work/lwt-3.1.0'