I am just "guessing" that you downloaded the year 2020 Arch version of Cinelerra ( https://cinelerra-gg.org/download/tars/cinelerra-5.1-arch-20201031.x86_64.txz) and that would explain the error message you get.  If that is the case, please download the AppImage instead at:
    https://cinelerra-gg.org/download/images/CinGG-20241231-x86_64.AppImage
Put it in the directory of your choice and be sure it has execute permission (chmod +x CinGG-20241231-x86_64.AppImage).  Then just start it from a window by keying in its filename, as:   ./CinGG-20241231-x86_64.AppImage

Andrea Paz builds on Arch all of the time with no problems. He usually keeps his Arch O/S updated all of the time too so it should run.  However, he did report recently that an older AppImage did not start for him.

On Mon, Feb 24, 2025 at 6:48 PM moop via Cin <cin@lists.cinelerra-gg.org> wrote:
Hello! Ive been trying to launch cin on my new arch device, I downloaded it following the instructions provided on the website and installed it through pacman, but when I try to launch it, I get the error:
cin: error while loading shared libraries: libIlmImf-2_5.so.25: cannot open shared object file: No such file or directory

None of the "solutions" I have found have been able to help, I was wondering if you would be able to assist me, or point me in the direction of someone who can.

Thank you for your time,
- Hugo 

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