To fix this issue I needed to modify the path settings in /etc/fpc.cfg, so maybe the package should do that automatically (set unit and library path to the proper locations, I'm not inserting my config here, because I'm not an expert and just tried around a bit, so I don't know, whether everything is like it should be). Also the IDE depends on libgtk-2-devel and some other development packages for compiling graphical applications.

Please also include readline in the dependencies. Support for the (ice-9 readline) module is missing:

scheme@(guile-user)> ,m (ice-9 readline)
While executing meta-command:
ERROR: In procedure dynamic-link: file: "libguilereadline-v-18", message: "file not found"