Thanks Bill, of course I forget the MPI_ROOT variable, adding that the make worked. But now I'm facing a new problem with cg.v24: when i make the program the compiler print out a huge list of errors of the type /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/istream:691: error: template with C linkage followed by some errors about MPI: /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions.h:61: error: declaration of C function ‘void MPI::Init()’ conflicts with /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions.h:58: error: previous declaration ‘void MPI::Init(int&, char**&)’ here /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions.h:86: error: declaration of C function ‘int MPI::Init_thread(int)’ conflicts with /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions.h:83: error: previous declaration ‘int MPI::Init_thread(int&, char**&, int)’ here /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/file.h:40: error: declaration of C function ‘void MPI::Register_datarep(const char*, int (*)(void*, ompi_datatype_t*, int, void*, MPI_Offset, void*), void (*)(void*, MPI::Datatype&, int, void*, MPI::Offset, void*), void (*)(const MPI::Datatype&, MPI::Aint&, void*), void*)’ conflicts with /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/file.h:33: error: previous declaration ‘void MPI::Register_datarep(const char*, void (*)(void*, MPI::Datatype&, int, void*, MPI::Offset, void*), void (*)(void*, MPI::Datatype&, int, void*, MPI::Offset, void*), void (*)(const MPI::Datatype&, MPI::Aint&, void*), void*)’ here /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/file.h:47: error: declaration of C function ‘void MPI::Register_datarep(const char*, void (*)(void*, MPI::Datatype&, int, void*, MPI::Offset, void*), int (*)(void*, ompi_datatype_t*, int, void*, MPI_Offset, void*), void (*)(const MPI::Datatype&, MPI::Aint&, void*), void*)’ conflicts with /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/file.h:40: error: previous declaration ‘void MPI::Register_datarep(const char*, int (*)(void*, ompi_datatype_t*, int, void*, MPI_Offset, void*), void (*)(void*, MPI::Datatype&, int, void*, MPI::Offset, void*), void (*)(const MPI::Datatype&, MPI::Aint&, void*), void*)’ here /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/file.h:54: error: declaration of C function ‘void MPI::Register_datarep(const char*, int (*)(void*, ompi_datatype_t*, int, void*, MPI_Offset, void*), int (*)(void*, ompi_datatype_t*, int, void*, MPI_Offset, void*), void (*)(const MPI::Datatype&, MPI::Aint&, void*), void*)’ conflicts with /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/file.h:47: error: previous declaration ‘void MPI::Register_datarep(const char*, void (*)(void*, MPI::Datatype&, int, void*, MPI::Offset, void*), int (*)(void*, ompi_datatype_t*, int, void*, MPI_Offset, void*), void (*)(const MPI::Datatype&, MPI::Aint&, void*), void*)’ here /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h:96: error: ‘void MPI::Init(int&, char**&)’ should have been declared inside ‘MPI’ /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h: In function ‘void MPI::Init(int&, char**&)’: /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h:96: error: declaration of C function ‘void MPI::Init(int&, char**&)’ conflicts with /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions.h:61: error: previous declaration ‘void MPI::Init()’ here /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h: At global scope: /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h:103: error: ‘void MPI::Init()’ should have been declared inside ‘MPI’ /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h: In function ‘void MPI::Init()’: /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h:103: error: declaration of C function ‘void MPI::Init()’ conflicts with /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h:96: error: previous declaration ‘void MPI::Init(int&, char**&)’ here /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h: At global scope: /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h:147: error: ‘int MPI::Init_thread(int&, char**&, int)’ should have been declared inside ‘MPI’ /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h: In function ‘int MPI::Init_thread(int&, char**&, int)’: /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h:147: error: declaration of C function ‘int MPI::Init_thread(int&, char**&, int)’ conflicts with /usr/lib64/openmpi/1.4-gcc/include/openmpi/ompi/mpi/cxx/functions_inln.h:137: error: previous declaration ‘int MPI::Init_thread(int)’ here make[1]: *** [obj/PETScSolver.o] Error 1 make[1]: Leaving directory `/local_data/usr/src/SW/cg.v24/ins' make: *** [cgins] Error 2 I think all the variable are well defined this time, is a compiler version problem? With the same compiler I installed the serial version without any problem! Thanks Alessandro Date: Wed, 21 Mar 2012 08:58:15 -0700 From: henshaw@xxxxxxxx To: overture@xxxxxxxxxxxxx Subject: [overture] Re: parallel overture and openmpi Hi Alessandro, mpi.h cannot be found -- I think you may need to define MPI_ROOT ...Bill On 03/21/2012 05:05 AM, Alessandro Orchini wrote: Hi, I'm installing a parallel version of Overture on Red Hat - Scientific Linux SL release 5.7, on which I've installed successfully the serial version So far i've installed openmpi and I've compiled P++, hdf5 in parallel and PETSc switching on the mpi configure option. Then I've configured Overture with the following commands export APlusPlus=/home/orchini/SW/A++P++-0.8.0/P++/install/ export PPlusPlus=/home/orchini/SW/A++P++-0.8.0/P++/install/ export OpenGL=/usr export XLIBS=/usr export MOTIF=/usr export HDF=/home/orchini/SW/hdf5-1.6.5 export Overture=/home/orchini/SW/Overture.v24 export PETSC_DIR=/home/orchini/SW/petsc-2.3.2 export PETSC_ARCH=linux-gnu-opt export PETSC_LIB=$PETSC_DIR/lib/$PETSC_ARCH export LAPACK=/usr ./configure multigrid petsc useHDF5 opt parallel FC=gfortran CC=g++ cc=gcc and it seems to work fine, but when I type make i got the following error: g++ -DHAVE_CONFIG_H -I. -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../.. -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../include -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../PARTI -I/include -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PADRE/src -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PADRE -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PADRE/PGSLIB -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PADRE/PGSLIB -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PGSLIB -I/home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../PGSLIB -O -fPIC -Wno-deprecated -c partitioning.C partitioning.C:10:20: error: mpi.h: No such file or directory /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/mpi-port.h:24: error: ‘MPI_Request’ has not been declared /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/mpi-port.h:25: error: ‘MPI_Request’ has not been declared /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/mpi-port.h:27: error: ‘MPI_Request’ has not been declared /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/mpi-port.h:28: error: ‘MPI_Request’ has not been declared /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/mpi-port.h:29: error: ‘MPI_Request’ was not declared in this scope /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/mpi-port.h:29: error: ‘gid’ was not declared in this scope /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/mpi-port.h:30: error: ‘MPI_Request’ was not declared in this scope /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/mpi-port.h:30: error: ‘gid’ was not declared in this scope /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../PARTI/port.h:56: error: ‘MPI_Comm’ does not name a type /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../include/comm_man.h:46: error: ‘MPI_Group’ does not name a type /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../include/comm_man.h:47: error: ‘MPI_Comm’ does not name a type /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../include/comm_man.h:99: error: ISO C++ forbids declaration of ‘MPI_Comm’ with no type /home/orchini/SW/A++P++-0.8.0/P++/install//../src/array_src/../../include/comm_man.h:99: error: expected ‘;’ before ‘&’ token make[1]: *** [partitioning.o] Error 1 make[1]: Leaving directory `/local_data/usr/src/SW/Overture.v24/GridFunction' make: *** [all] Error 2 Should I define some extra variable that I am missing? Thanks Alessandro