Hello, thanks for the patch! I tried to remove the marketing speech out of the description. For the #:build-type, the default value (release with debug information) also works and results in a package of the same size. Is there a reason to change it? Modified patch attached. I can also compile the package without the configure flags, are they useful? In the end dynamic and static libraries end up in a directory lib64/. Should this not be lib/? And there are lots of warnings about 34 bit shifts in a 32 bit type. But I suppose you tested that the library works. Andreas