#=== ERROR while installing camlp4.4.02+7 =====================================#
# opam-version 1.2.2
# os           linux
# command      make all
# path         /home/gar/.opam/working/build/camlp4.4.02+7
# compiler     4.02.3
# exit-code    2
# env-file     /home/gar/.opam/working/build/camlp4.4.02+7/camlp4-8921-559acc.env
# stdout-file  /home/gar/.opam/working/build/camlp4.4.02+7/camlp4-8921-559acc.out
# stderr-file  /home/gar/.opam/working/build/camlp4.4.02+7/camlp4-8921-559acc.err
### stdout ###
# [...]
# camlp4/config/gen_import.byte /home/gar/.opam/working/lib/ocaml
# /home/gar/.opam/working/bin/ocamldep.opt -modules camlp4/config/Camlp4_import.ml > camlp4/config/Camlp4_import.ml.depends
# /home/gar/.opam/working/bin/ocamlc.opt -c -g -w Z -I camlp4/import -warn-error A-3 -I camlp4/config -I camlp4 -o camlp4/config/Camlp4_import.cmo camlp4/config/Camlp4_import.ml
# /home/gar/.opam/working/bin/ocamlopt.opt -c -g -w Z -I camlp4/import -warn-error A-3 -I camlp4/config -I camlp4 -o camlp4/config/Camlp4_import.cmx camlp4/config/Camlp4_import.ml
# /home/gar/.opam/working/bin/ocamlopt.opt -c -g -w Z -I camlp4/import -warn-error A-3 -I camlp4/config -I camlp4 -o camlp4/config/Camlp4_config.cmx camlp4/config/Camlp4_config.ml
# /home/gar/.opam/working/bin/ocamlopt.opt -c -g -w a -I camlp4/import -warn-error A-3 -I camlp4/config -I camlp4/boot -o camlp4/boot/Camlp4.cmx camlp4/boot/Camlp4.ml
# + /home/gar/.opam/working/bin/ocamlopt.opt -c -g -w a -I camlp4/import -warn-error A-3 -I camlp4/config -I camlp4/boot -o camlp4/boot/Camlp4.cmx camlp4/boot/Camlp4.ml
# Segmentation fault (core dumped)
# Command exited with code 139.
# Makefile:13: recipe for target 'byte' failed
### stderr ###
# + echo camlp4/Camlp4.cmo camlp4/Camlp4Top.cmo camlp4/camlp4prof.byte camlp4/mkcamlp4.byte camlp4/camlp4.byte camlp4/camlp4fulllib.cma camlp4/camlp4boot.byte camlp4/camlp4boot.cma camlp4/camlp4r.byte camlp4/camlp4r.cma camlp4/camlp4rf.byte camlp4/camlp4rf.cma camlp4/camlp4o.byte camlp4/camlp4o.cma camlp4/camlp4of.byte camlp4/camlp4of.cma camlp4/camlp4oof.byte camlp4/camlp4oof.cma camlp4/camlp4orf.byte camlp4/camlp4orf.cma camlp4/Camlp4Parsers/Camlp4AstLoader.cmo camlp4/Camlp4Parsers/Camlp4DebugParser.cmo camlp4/Camlp4Parsers/Camlp4GrammarParser.cmo camlp4/Camlp4Parsers/Camlp4ListComprehension.cmo camlp4/Camlp4Parsers/Camlp4MacroParser.cmo camlp4/Camlp4Parsers/Camlp4OCamlOriginalQuotationExpander.cmo camlp4/Camlp4Parsers/Camlp4OCamlParser.cmo camlp4/Camlp4Parsers/Camlp4OCamlParserParser.cmo camlp4/Camlp4Parsers/Camlp4OCamlReloadedParser.cmo camlp4/Camlp4Parsers/Camlp4OCamlRevisedParser.cmo camlp4/Camlp4Parsers/Camlp4OCamlRevisedParserParser.cmo camlp4/Camlp4Parsers/Camlp4OCamlRevisedQuotationExpander.cmo camlp4/Camlp4Parsers/Camlp4QuotationCommon.cmo camlp4/Camlp4Parsers/Camlp4QuotationExpander.cmo camlp4/Camlp4Printers/Camlp4AstDumper.cmo camlp4/Camlp4Printers/Camlp4AutoPrinter.cmo camlp4/Camlp4Printers/Camlp4NullDumper.cmo camlp4/Camlp4Printers/Camlp4OCamlAstDumper.cmo camlp4/Camlp4Printers/Camlp4OCamlPrinter.cmo camlp4/Camlp4Printers/Camlp4OCamlRevisedPrinter.cmo camlp4/Camlp4Filters/Camlp4AstLifter.cmo camlp4/Camlp4Filters/Camlp4ExceptionTracer.cmo camlp4/Camlp4Filters/Camlp4FoldGenerator.cmo camlp4/Camlp4Filters/Camlp4LocationStripper.cmo camlp4/Camlp4Filters/Camlp4MapGenerator.cmo camlp4/Camlp4Filters/Camlp4MetaGenerator.cmo camlp4/Camlp4Filters/Camlp4Profiler.cmo camlp4/Camlp4Filters/Camlp4TrashRemover.cmo
# make: *** [byte] Error 10



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions were aborted
  ∗  install cohttp              0.21.0
  ∗  install conduit             0.12.0
  ∗  install cstruct             2.2.0
  ∗  install lambdasoup          0.6
  ∗  install lwt                 2.5.2
  ∗  install markup              0.7.2
  ∗  install oasis               0.4.6
  ∗  install ocaml-data-notation 0.0.11
  ∗  install plist               0.1
  ∗  install type_conv           113.00.02
  ∗  install usbmux              1.3.1
The following actions failed
  ∗  install camlp4 4.02+7
The following changes have been performed
  ∗  install base-bytes          base
  ∗  install base64              2.0.0
  ∗  install biniou              1.0.12
  ∗  install cmdliner            0.9.8
  ∗  install conf-m4             1
  ∗  install conf-ncurses        1
  ∗  install conf-pkg-config     1.0
  ∗  install conf-which          1
  ∗  install cppo                1.3.2
  ∗  install easy-format         1.2.0
  ∗  install fieldslib           113.33.03
  ∗  install ipaddr              2.7.0
  ∗  install js-build-tools      113.33.04
  ∗  install magic-mime          1.0.0
  ∗  install ocamlbuild          0
  ∗  install ocamlfind           1.6.2
  ∗  install ocamlify            0.0.1
  ∗  install ocamlmod            0.0.8
  ∗  install ocplib-endian       1.0
  ∗  install ppx_core            113.33.03
  ∗  install ppx_deriving        4.0
  ∗  install ppx_deriving_yojson 3.0
  ∗  install ppx_driver          113.33.03
  ∗  install ppx_fields_conv     113.33.03
  ∗  install ppx_optcomp         113.33.03
  ∗  install ppx_sexp_conv       113.33.03
  ∗  install ppx_tools           5.0+4.02.0
  ∗  install ppx_type_conv       113.33.03
  ∗  install re                  1.6.1
  ∗  install result              1.2
  ∗  install sexplib             113.33.03
  ∗  install stringext           1.4.2
  ∗  install uri                 1.9.2
  ∗  install uutf                0.9.4
  ∗  install yojson              1.3.2

The former state can be restored with:
    opam switch import "~/.opam/working/backup/state-20160709155512.export"