It turns out that nxcomp* is built in such a way that the +x bit is
missing after `make install`, which in turn leads to rpm not considering
the file for dependency resolution. This should be fixed
- $(INSTALL_DATA) $(LIBFULL) $(DESTDIR)${libdir}/nx
+ $(INSTALL_PROGRAM) $(LIBFULL) ...
(for nxcomp, nxcompshad and nxcompext)