- fix typo in configuration flags
- add ``-DCMAKE_SKIP_RPATH=ON'' to configuration flags to fix shared
  library compilation.

This package requires more works regarding:
- making optional dependencies configurable through robotpkg.conf
- checking for system dependencies properly
- currently install a static library only, shared libraries
  installation is not working and a patch should be done to fix this
  (still to be done). Issue reported to upstream.