Hello Andreas, I just built ghmm by removing --with-gsl.
It seems that the gsl implementation of blas conflict with the one provided in atlas. so --enable-gsl + --enable-atlas seems wrong... +------------------------------------------------------------------------------+ | Summary | +------------------------------------------------------------------------------+ Build Architecture: amd64 Build Type: binary Build-Space: 39004 Build-Time: 31 Distribution: UNRELEASED Host Architecture: amd64 Install-Time: 14 Job: /tmp/ghmm_0.9~rc3-3.dsc Machine Architecture: amd64 Package: ghmm Package-Time: 49 Source-Version: 0.9~rc3-3 Space: 39004 Status: successful Version: 0.9~rc3-3