I've installed iemmatrix from deken, but when I put a [declare -lib iemmatrix] in Pd, I get the following error:

/home/alex/Documents/Pd/externals/iemmatrix/iemmatrix.pd_linux:libgsl.so.25: cannot open shared object file: No such file or directory

I'm on Debian 12, with Pd-0.54.1