esy build fails: esy-build-package: Error: exception Sys_error("/usr/lib/ocaml/METAS: No such file or directory")

[ambientlight]

Because of #9, had to go with an own build on ubuntu, though got esy build failing with

info esy build 0.5.8 (using esy.json)
info building @opam/cppo@opam:1.6.6@f4f83858
info building @opam/ppx_derivers@opam:1.2.1@ecf0aa45
info building @opam/result@opam:1.4@dc720aef
info building @opam/seq@opam:0.2@35c16df8
info building @opam/stdlib-shims@opam:0.1.0@d957c903
info building @opam/easy-format@opam:1.3.1@54402780
error: build failed with exit code: 1
  build log:
    # esy-build-package: building: @opam/cppo@opam:1.6.6
    # esy-build-package: pwd: /home/hlegacy/.esy/3__________________________________________________________________/b/opam__s__cppo-opam__c__1.6.6-4890b2aa
    # esy-build-package: running: 'dune' 'build' '-p' 'cppo' '-j' '4'
    Error: exception Sys_error("/usr/lib/ocaml/METAS: No such file or directory")
    Backtrace:
    Raised by primitive operation at file "src/stdune/path.ml", line 878, characters 25-50
    Called from file "src/findlib.ml", line 441, characters 6-31
    Called from file "list.ml", line 93, characters 22-25
    Called from file "src/stdune/list.ml" (inlined), line 5, characters 19-33
    Called from file "src/stdune/list.ml", line 39, characters 29-39
    Called from file "src/findlib.ml", line 440, characters 4-265
    Called from file "src/findlib.ml", line 453, characters 20-37
    Called from file "src/findlib.ml", line 457, characters 2-21
    Called from file "src/lib.ml", line 1334, characters 6-34
    Called from file "src/super_context.ml", line 288, characters 4-70
    Called from file "src/gen_rules.ml", line 327, characters 6-161
    Called from file "src/fiber/fiber.ml", line 99, characters 6-13
    
    I must not segfault.  Uncertainty is the mind-killer.  Exceptions are
    the little-death that brings total obliteration.  I will fully express
    my cases.  Execution will pass over me and through me.  And when it
    has gone past, I will unwind the stack along its path.  Where the
    cases are handled there will be nothing.  Only I will remain.
    error: command failed: 'dune' 'build' '-p' 'cppo' '-j' '4' (exited with 1)
    esy-build-package: exiting with errors above...
    
  building @opam/cppo@opam:1.6.6
esy: exiting due to errors above

Not familiar with esy, but I have 4.05.0 ocaml compiler installed with opam, any suggestions here?

[ambientlight]

surprisingly, manually creating empty METAS folder made it work.
I also needed to add "@opam/merlin-extend": "0.4", into devDependencies intoesy.json` for build to go through.