per@konjak:~$ opam switch create 4.07.1

<><> Gathering sources ><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ocaml-base-compiler.4.07.1] downloaded from cache at https://opam.ocaml.org/cache

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
∗ installed base-bigarray.base
∗ installed base-threads.base
∗ installed base-unix.base
[ERROR] The compilation of ocaml-base-compiler failed at "/home/per/.opam/opam-init/hooks/sandbox.sh build make world".

#=== ERROR while compiling ocaml-base-compiler.4.07.1 =========================#
# context     2.0.4 | linux/x86_64 |  | https://opam.ocaml.org#81a37ea2
# path        ~/.opam/4.07.1/.opam-switch/build/ocaml-base-compiler.4.07.1
# command     ~/.opam/opam-init/hooks/sandbox.sh build make world
# exit-code   2
# env-file    ~/.opam/log/ocaml-base-compiler-22610-d8a4ae.env
# output-file ~/.opam/log/ocaml-base-compiler-22610-d8a4ae.out
### output ###
# [...]
# /usr/bin/ld: prims.o:(.data.rel+0x9d0): undefined reference to `caml_restore_ra'
# /usr/bin/ld: prims.o:(.data.rel+0xa18): undefined reference to `caml_spacetime_only_'
# /usr/bin/ld: prims.o:(.data.rel+0xac8): undefined reference to `caml_sys_const_'
# /usr/bin/ld: prims.o:(.data.rel+0xae8): undefined reference to `caml_sys_const_max_'
# /usr/bin/ld: prims.o:(.data.rel+0xaf0): undefined reference to `caml_sys_const_ostype_'
# /usr/bin/ld: prims.o:(.data.rel+0xaf8): undefined reference to `caml_sys_const_ostype_cyg'
# /usr/bin/ld: prims.o:(.data.rel+0xb28): undefined reference to `caml_sys_getc'
# /usr/bin/ld: prims.o:(.data.rel+0xba0): undefined reference to `caml_terminfo_ro'
# collect2: error: ld returned 1 exit status
# make[1]: *** [Makefile:187: ocamlrun] Fel 1
# make[1]: Lämnar katalogen ”/home/per/.opam/4.07.1/.opam-switch/build/ocaml-base-compiler.4.07.1/byterun”
# make: *** [Makefile:389: coldstart] Fel 2



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build ocaml-base-compiler 4.07.1
└─ 
┌─ The following changes have been performed (the rest was aborted)
│ ∗ install base-bigarray base
│ ∗ install base-threads  base
│ ∗ install base-unix     base
└─ 
Switch initialisation failed: clean up? ('n' will leave the switch partially installed) [Y/n] Y