failed build

% opam build
Found the following packages:
  - wombat.0.1.0 (./wombat.opam)
The following actions will be performed:
  ∗  install wombat 0.1.0

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[wombat.0.1.0] synchronised from file:///mnt/c/Users/wtetzner/wip/wombat

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[ERROR] The compilation of wombat failed at "jbuilder build -p wombat -j 3".

#=== ERROR while compiling wombat.0.1.0 =======================================#
# command      jbuilder build -p wombat -j 3
# path         /mnt/c/Users/wtetzner/wip/wombat/_opam/.opam-switch/build/wombat.0.1.0
# exit-code    1
# env-file     /home/wtetzner/.opam/log/wombat-26056-d2c37b.env
# output-file  /home/wtetzner/.opam/log/wombat-26056-d2c37b.out
### output ###
# Executable wombat in _build/default doesn't have a corresponding .ml file



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
┌─ The following actions failed
│ λ  build wombat 0.1.0
└─
╶─ No changes have been performed
# Run eval `opam env` to update the current shell environment