Hello, I have compiled a code (siesta) by mpich2, blacs, lapack, blas and scalapack. It works fine under grid computation. But when I want to "make" a utility, I receive the following errors: [Home@localhost Gen-basis]$ make /usr/local/bin/mpif90 -o gen-basis \ alloc.o basis_types.o precision.o recipes.o parallel.o parsing.o xcmod.o basis_io.o chemical.o atm_transfer.o atm_types.o atmparams.o old_atmfuncs.o radial.o io.o paste.o flib_spline.o bessph.o m_filter.o basis_specs.o atom.o memoryinfo.o memory.o periodic_table.o pseudopotential.o pxf.o dot.o xc.o atom_options.o arw.o sys.o timer.o xml.o m_walltime.o gen-basis.o nag.o libfdf.a /home/Home/Packages/scalapack-2.0.2/libscalapack.a /home/Home/Packages/BLACS/LIB/blacsCinit_MPI-LINUX-0.a /home/Home/Packages/BLACS/LIB/blacsF77init_MPI-LINUX-0.a /home/Home/Packages/BLACS/LIB/blacs_MPI-LINUX-0.a /home/Home/Packages/lapack-3.4.2/liblapack.a /home/Home/Packages/BLAS/blas_LINUX.a alloc.o: In function `print_report': /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/alloc.F90:1705: undefined reference to `__mpi__r8_s_MOD_mpi_reduce_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/alloc.F90:1707: undefined reference to `__mpi__r8_v_MOD_mpi_reduce_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/alloc.F90:1711: undefined reference to `__mpi__integer_s_MOD_mpi_bcast_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/alloc.F90:1723: undefined reference to `__mpi__r8_s_MOD_mpi_recv_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/alloc.F90:1718: undefined reference to `__mpi__r8_s_MOD_mpi_send_t' alloc.o: In function `__alloc_MOD_alloc_report': /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/alloc.F90:318: undefined reference to `__mpi__integer_s_MOD_mpi_bcast_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/alloc.F90:319: undefined reference to `__mpi__integer_s_MOD_mpi_bcast_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/alloc.F90:320: undefined reference to `__mpi__character_s_MOD_mpi_bcast_t' xcmod.o: In function `__xcmod_MOD_setxc': /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/xcmod.F:136: undefined reference to `__mpi__integer_s_MOD_mpi_bcast_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/xcmod.F:138: undefined reference to `__mpi__character_v_MOD_mpi_bcast_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/xcmod.F:140: undefined reference to `__mpi__character_v_MOD_mpi_bcast_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/xcmod.F:142: undefined reference to `__mpi__r8_v_MOD_mpi_bcast_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/xcmod.F:144: undefined reference to `__mpi__r8_v_MOD_mpi_bcast_t' memory.o: In function `printmemory_': /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/memory.F:144: undefined reference to `__mpi__integer_s_MOD_mpi_allreduce_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/memory.F:167: undefined reference to `__mpi__integer_sv_MOD_mpi_gather_t' timer.o: In function `timer1_': /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/timer.F:117: undefined reference to `__mpi__r8_s_MOD_mpi_allreduce_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/timer.F:164: undefined reference to `__mpi__r8_v_MOD_mpi_reduce_t' /home/Home/Packages/siesta-TEST-3.2/Util/Gen-basis/../../Src/timer.F:139: undefined reference to `__mpi__r8_v_MOD_mpi_reduce_t' collect2: error: ld returned 1 exit status make: *** [gen-basis] Error 1 I will be really grateful if you kindly help me to solve this problem.