Hi, I'm very new to Haskell and this Forum, just doing my first steps ... -- Try to use the hmatrix package for vector and matrix calculations. The haskell compilation works (no problem in GHCi mode), the gcc however compilation fails with messages like: EFA.o: In function `r1bo_info': (.text+0x48): undefined reference to `hmatrixzm0zi10zi0zi0_NumericziVector_zdfNumVector1_closure' EFA.o: In function `r1bs_info': (.text+0x10a): undefined reference to `hmatrixzm0zi10zi0zi0_NumericziVector_zdfFractionalVector_closure' Obviously gcc doesn't know where the according libraries are installed. Same problem with other packages. I installed the haskell base system over debian (debian squeeze), gcc version 4.4.5. - Hmatrix and other packages are installed and build over cabel into local folder ~/.cabal/lib Do I need to set a system path, or change cabal options or .. ? Thanks in advance, Phil -- View this message in context: http://haskell.1045720.n5.nabble.com/Haskell-on-Debian-gcc-compilation-probl... Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.