On Sat, Jul 02, 2011 at 12:22:25 +0200, Eric Tanguy <eric.tanguy(a)gmail.com&gt; wrote: I'm taking a look at qucs now. I might be able to figure this out. The users list isn't the right place for this question. The devel list is a much better place to ask for help from other packagers. It would have probably helped to included enough of the build log in your request for help that people could judge where the problem was and whether or not they'd likely to be able help with out going to the FTBFS bug and downloading attachments until the found the one that indicated the problem. Something like: There were a number of errors refering to an ambiguous type, for example: spfile.cpp: In member function 'matrix spfile::correlationMatrix(double, nr_complex_t, double, matrix)': spfile.cpp:405:21: error: call of overloaded 'conj(nr_complex_t)' is ambiguous /usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../include/c++/4.5.1/complex:667:33: note: candidates are: std::complex<_Tp> std::conj(const std::complex<_Tp>&) [with _Tp = double]