opam install llvm
The following actions will be performed:
  ∗  install llvm 3.9

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[default] https://opam.ocaml.org/archives/llvm.3.9+opam.tar.gz downloaded

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[ERROR] The compilation of llvm failed at "bash -ex ./build.sh 3.9 /home/dmruiz/.opam/4.02.3/lib".
Processing  1/1: [llvm: sh]
#=== ERROR while installing llvm.3.9 ==========================================#
# opam-version 1.2.2
# os           linux
# command      bash -ex ./build.sh 3.9 /home/dmruiz/.opam/4.02.3/lib
# path         /home/dmruiz/.opam/4.02.3/build/llvm.3.9
# compiler     4.02.3
# exit-code    1
# env-file     /home/dmruiz/.opam/4.02.3/build/llvm.3.9/llvm-9374-ad8886.env
# stdout-file  /home/dmruiz/.opam/4.02.3/build/llvm.3.9/llvm-9374-ad8886.out
# stderr-file  /home/dmruiz/.opam/4.02.3/build/llvm.3.9/llvm-9374-ad8886.err
### stdout ###
# Error: '3.9' should have returned either shared or static
### stderr ###
# + llvm_config=3.9
# + libdir=/home/dmruiz/.opam/4.02.3/lib
# + cmake=
# + case `"$llvm_config" --shared-mode` in
# ++ 3.9 --shared-mode
# ./build.sh: line 7: 3.9: command not found
# + echo 'Error: '\''3.9'\'' should have returned either shared or static'
# + exit 1



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions failed
  ∗  install llvm 3.9
No changes have been performed

=-=- llvm.3.9 troobleshooting -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
=> This package relies on external (system) dependencies that may be missing. `opam depext llvm.3.9' may help you find the correct installation for your system.