% opam install merlin
The following actions will be performed:
 - install biniou.1.0.9 [required by merlin]
 - install yojson.1.1.8 [required by merlin]
 - install merlin.2.0.0
3 to install | 0 to reinstall | 0 to upgrade | 0 to downgrade | 0 to remove
Do you want to continue ? [Y/n]

=-=-= Installing biniou.1.0.9 =-=-=
Building biniou.1.0.9:
  make
  make install
[ERROR] The compilation of biniou.1.0.9 failed.
Removing biniou.1.0.9.
  ocamlfind remove biniou

[ERROR] Due to some errors while processing biniou.1.0.9, the following actions will NOT proceed:
 - install merlin.2.0.0
 - install yojson.1.1.8

===== ERROR while installing biniou.1.0.9 =====
# opam-version 1.1.1
# os           linux
# command      make install
# path         /home/rmm/.opam/4.02.0/build/biniou.1.0.9
# compiler     4.02.0
# exit-code    2
# env-file     /home/rmm/.opam/4.02.0/build/biniou.1.0.9/biniou-29479-5f1023.env
# stdout-file  /home/rmm/.opam/4.02.0/build/biniou.1.0.9/biniou-29479-5f1023.out
# stderr-file  /home/rmm/.opam/4.02.0/build/biniou.1.0.9/biniou-29479-5f1023.err
### stdout ###
# ...[truncated]
# ocamlopt -shared -linkall -I . -o biniou.cmxs biniou.cmxa
# ocamlfind ocamlopt -o bdump -dtypes -g \
#       -package easy-format -linkpkg \
#       biniou.cmxa bdump.ml
# ocamlfind ocamlopt -o test_biniou -dtypes -g \
#       -package "easy-format unix" -linkpkg \
#       biniou.cmxa test_biniou.ml
# sed -e 's:@@VERSION@@:1.0.9:' META.in > META
# test ! -f bdump || cp bdump /bin/
# Makefile:79: recipe for target 'install' failed
### stderr ###
# ...[truncated]
# Try 'dirname --help' for more information.
# dirname: missing operand
# Try 'dirname --help' for more information.
# /bin/sh: which: command not found
# dirname: missing operand
# Try 'dirname --help' for more information.
# dirname: missing operand
# Try 'dirname --help' for more information.
# cp: cannot create regular file ‘/bin/bdump’: Permission denied
# make: *** [install] Error 1