Since last time I pulled petsc-dev (2 months) something probably changed with matrices creation of so, now I can't do it from Fortran: /home/main_mod.F90:(.text+0x4a3): undefined reference to `matcreatempiaij_' /home/main_mod.F90:(.text+0x5979): undefined reference to `matcreatempidense_' /home/main_mod.F90:(.text+0x59de): undefined reference to `matcreatempiaij_' Same program compiles just fine with: Using Petsc Development HG revision: 7c3c3f8c0d65b793aea33c138419de755b591ca7 HG Date: Thu Feb 09 14:42:30 2012 -0600 Something from my side or...? -- Regards, Alexander