This package installs also static libs ".a" please provide do add relative USE. TIA /usr/lib/libIDL-2.a /usr/lib/libIDL-2.so.0.0.0 /usr/lib/libIDL-2.la /usr/lib/pkgconfig/libIDL-2.0.pc /usr/lib/libIDL-2.so /usr/lib/libIDL-2.so.0 Please remove also .la if is not needed.
This library is deprecated, not sure why mozilla packages are pulling it in... I've completely disabled the static library support.