...and 2.2.4 also fails to build:
https://github.com/savonet/liquidsoap/issues/3752
$ make
<command-line>: warning: "_FORTIFY_SOURCE" redefined
<built-in>: note: this is the location of the previous definition
<command-line>: warning: "_FORTIFY_SOURCE" redefined
<built-in>: note: this is the location of the previous definition
<command-line>: warning: "_FORTIFY_SOURCE" redefined
<built-in>: note: this is the location of the previous definition
<command-line>: warning: "_FORTIFY_SOURCE" redefined
<built-in>: note: this is the location of the previous definition
File "src/core/decoder/gstreamer_decoder.ml", line 314, characters 37-51:
314 | (Decoder.test_file ~log ~mimes:mime_types#get
^^^^^^^^^^^^^^
Error: This expression has type string list
but an expression was expected of type string list option
make: *** [Makefile:4: build] Error 1
