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~ % opam install utop                                                                                   (master⚡)
The following actions will be performed:
 - install camomile.0.8.5 [required by utop]
 - install zed.1.3 [required by utop]
 - install lambda-term.1.6 [required by utop]
 - install utop.1.14
4 to install | 0 to reinstall | 0 to upgrade | 0 to downgrade | 0 to remove
Do you want to continue ? [Y/n] 

=-=-= Installing camomile.0.8.5 =-=-=
Applying cmxs.patch.
Building camomile.0.8.5:
  ./configure --prefix /Users/seth_tisue/.opam/system
  make
  make install
[ERROR] The compilation of camomile.0.8.5 failed.
Removing camomile.0.8.5.
  ocamlfind remove camomile

[ERROR] Due to some errors while processing camomile.0.8.5, the following actions will NOT proceed:
 - install utop.1.14
 - install lambda-term.1.6
 - install zed.1.3

===== ERROR while installing camomile.0.8.5 =====
# opam-version 1.1.2
# os           darwin
# command      make
# path         /Users/seth_tisue/.opam/system/build/camomile.0.8.5
# compiler     system (4.01.0)
# exit-code    2
# env-file     /Users/seth_tisue/.opam/system/build/camomile.0.8.5/camomile-90943-c61e7b.env
# stdout-file  /Users/seth_tisue/.opam/system/build/camomile.0.8.5/camomile-90943-c61e7b.out
# stderr-file  /Users/seth_tisue/.opam/system/build/camomile.0.8.5/camomile-90943-c61e7b.err
### stdout ###
# ...[truncated]
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . internal/xArray.ml
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . public/oOChannel.ml
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . public/uChar.ml
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . public/locale.ml
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . public/uTF8.ml
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . public/uTF16.ml
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . public/uCS4.ml
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . internal/uReStrLexer.ml
# ocamlopt.opt -c -noassert -I internal -I public -I toolslib -I . toolslib/camomileconfig.ml
# rm internal/uReStrLexer.ml
### stderr ###
# config.status: WARNING:  'Makefile.in' seems to ignore the --datarootdir setting
# File "internal/uReStrLexer.mll", line 37, characters 0-17:
# Error: Unbound module UReStrParser
# make: *** [internal/uReStrLexer.cmx] Error 2
# make: *** Waiting for unfinished jobs....

'opam install utop' failed.