[solved] ffmpeg-compat, fpc and library path

[Tariella]

I have an ebuild which requires a really old version of ffmpeg and its libraries.
After a bit of research I stumbled across the ffmpeg-compat package and its respective eclass and decided to try to edit the ebuild to change the dependencies from ffmpeg to ffmpeg-compat:4.

I followed the wiki for ffmpeg-compat.eclass and looked at ebuilds using it as an example, before adding the following to my ebuild:

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src_configure() {
        ffmpeg_compat_setup 4
       ffmpeg_compat_add_flags
}

Sadly, my ebuild is using fpc as the compiler and crashes with the following error:

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Illegal parameter: -L/usr/lib/ffmpeg4/lib64

The full command that triggers the error looks like this:

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fpc -Si -Sg -Sc -v0Binwe -Xs -O4 -k"-z noexecstack" "-L/usr/lib/ffmpeg4/lib64" -Fi../src/lib/JEDI-SDL/SDL/Pas -Fu. -FU../dists/linux/fpc-x86_64-linux -o../game/WorldParty WorldParty.dpr

After some research, I believe that the correct parameter to set the library path for fpc should be

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-Fl/usr/lib/ffmpeg4/lib64

Is it possible for me to define this correctly in my ebuild and where and how would I do this?

Please consider that I am actually a complete noob in ebuild writing and have never done anything more complex than patching a makefile or editing dependency versions / paths.

[Ionen]

I'd suggest not spending time on anything needing ffmpeg /4/, we could decide to drop ffmpeg-compat:4 anytime given almost no packages need it anymore. Not that been in a hurry so it'll still be there for some time.

That aside, don't think I can help when fpc is involved, I didn't write ffmpeg-compat.eclass to be all that versatile/universal but rather just work for the cases where we need it. It also relies on a pkg-config rpath injection hack which I imagine won't work as-is here.

[Tariella]

Thanks for the answer.

Sadly, this package is otherwise only available via snap (which depends on systemd). I'd never bother messing with the ebuild if there were an easier option.
I guess I'll just have to chroot into my old system whenever I want to use this program, for now.

[rab0171610]

Are you referring to UltraStar WorldParty? If so, have you ever tried Peformous or Vocaluxe? They can both be built from source. Also, UltraStar Deluxe has a new appimage available. I know they are not the same thing and the song formats might not be compatible, but I thought I would mention it.

[Tariella]

Yes, I was indeed referring to Ultrastar Worldparty.
It's been a while since I tested the alternatives and back then it was not worth the trouble of porting my settings to another software. Afair, Performous was still in development and missing some features and Ultrastar Deluxe was discontinued.

Thanks for the hint, I'll check the mentioned apps for compatibility with my songfiles and most important settings.