Same thing, with a new installation under Debian 9/64 and Debian 10/64.
Liquidsoap installation error !!!

Même chose, avec une nouvelle installation sous Debian 9/64 et Debian 10/64.
Erreur de l'installation de liquidsoap

#=== ERROR while compiling liquidsoap.1.3.7 ===================================#
# context     2.0.5 | linux/x86_64 | ocaml-base-compiler.4.07.1 | https://opam.ocaml.org#5484ff3c
# path        ~/.opam/4.07.1/.opam-switch/build/liquidsoap.1.3.7
# command     ~/.opam/opam-init/hooks/sandbox.sh build make
# exit-code   2
# env-file    ~/.opam/log/liquidsoap-89175-6d07ae.env
# output-file ~/.opam/log/liquidsoap-89175-6d07ae.out
### output ###
# Error: Signature mismatch:
# [...]
#              | `Samplerate of int
#              | `Sbr_mode of bool
#              | `Transmux of transmux ]
#        File "encoder/fdkaac_encoder.ml", line 54, characters 8-328:
#          Expected declaration
#        File "src/fdkaac.mli", line 101, characters 2-277: Actual declaration
# make[2]: *** [../Makefile.rules:197: encoder/fdkaac_encoder_builtin.cmx] Error 2
# make[2] : on quitte le répertoire « /usr/local/centovacast/.opam/4.07.1/.opam-switch/build/liquidsoap.1.3.7/src »
# make[1]: *** [../Makefile.rules:67: all-auto-ocaml-prog] Error 2
# make[1] : on quitte le répertoire « /usr/local/centovacast/.opam/4.07.1/.opam-switch/build/liquidsoap.1.3.7/src »
# make: *** [Makefile.rules:27: all-subdirs] Error 2


<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build liquidsoap 1.3.7
└─
╶─ No changes have been performed
! Error: Failed to build Liquidsoap
! Error: Installation failed
Liquidsoap installation failed
Installer exited with error, aborting

I have the same problem
no support here? HELP PLEASE!!

my server:
[root @ host ~] # uname -a
Linux ...... 3.10.0-1062.18.1.el7.x86_64 # 1 SMP Tue Mar 17 23:49:17 UTC 2020 x86_64 x86_64 x86_64 GNU / Linux