On 16-09-2022 15:37, Lars-Dominik Braun wrote:
> +                                 " -lSDL2_image -ldl "
> +                                 "-lz -lfreetype -lportaudio -lavcodec "
> +                                 "-lavformat -lavutil -lswresample "
> +                                 "-lswscale -llua -ldl -lX11 -lportmidi "
> +                                 "-L" #$zlib "/lib "
> +                                 "-L" #$libx11 "/lib "
> +                                 "-L" #$portmidi "/lib ")))))

To make --with-input transformations work, these #$foo need to be 
replaced by #$(this-package-input "zlib").  To avoid input labels,
you can replace #$zlib "/lib" by
(dirname (search-input-file inputs "lib/libz.so")).

Greetings,
Maxime.