This is a rather obscure question, I realize. I have written to the package author but have not heard back as of yet. I have read the README in the package, as well, but it didn't give me enough detail to diagnose the problems that I am having. (I did edit out the LAM-MPI check in zzz.R.in.) I am working to install Rmpi on top of MPICH on a beowulf cluster. Below is the output of the install command (which seems to go OK and then the start of the R session, which fails. I was hoping someone with some experience installing Rmpi on MPICH could give me some help with doing so. Any help would be greatly appreciated.... Sean [sdavis at beowulf Rmpi]$ R CMD INSTALL --configure-args=--with-mpi=/opt/lib32/usr/lib --library='/home/sdavis/R/library' ../Rmpi_0.4-9.tar.gz * Installing *source* package 'Rmpi' ... Try to find mpi.h ... checking for gcc... gcc checking for C compiler default output... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ANSI C... none needed checking how to run the C preprocessor... gcc -E checking for egrep... grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking mpi.h usability... yes checking mpi.h presence... yes checking for mpi.h... yes Try to find libmpi ... checking for main in -lmpi... yes Try to find liblam ... checking for main in -llam... no liblam not found. Probably not LAM-MPI checking for openpty in -lutil... yes checking for main in -lpthread... yes configure: creating ./config.status config.status: creating src/Makevars config.status: creating R/zzz.R ** libs gcc -I/usr/lib/R/include -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -I/usr/local/include -fPIC -O2 -g -pipe -march=i386 -mcpu=i686 -c conversion.c -o conversion.o gcc -I/usr/lib/R/include -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -I/usr/local/include -fPIC -O2 -g -pipe -march=i386 -mcpu=i686 -c internal.c -o internal.o gcc -I/usr/lib/R/include -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -I/usr/local/include -fPIC -O2 -g -pipe -march=i386 -mcpu=i686 -c Rmpi.c -o Rmpi.o gcc -shared -L/usr/local/lib -o Rmpi.so conversion.o internal.o Rmpi.o -lmpi -lutil -lpthread ** R ** demo ** inst ** preparing package for lazy loading ** help >>> Building/Updating help pages for package 'Rmpi' Formats: text html latex example hosts text html latex internal text html latex mpi.abort text html latex mpi.barrier text html latex mpi.bcast text html latex mpi.bcast.Robj text html latex mpi.bcast.cmd text html latex mpi.comm text html latex example mpi.comm.disconnect text html latex mpi.comm.free text html latex mpi.comm.inter text html latex mpi.comm.set.errhandler text html latex mpi.comm.spawn text html latex mpi.const text html latex mpi.exit text html latex mpi.finalize text html latex mpi.gather text html latex mpi.get.count text html latex mpi.get.processor.name text html latex mpi.get.sourcetag text html latex mpi.info text html latex mpi.init.sprng text html latex mpi.intercomm.merge text html latex mpi.parallel.sim text html latex mpi.probe text html latex mpi.reduce text html latex mpi.remote.exec text html latex mpi.scatter text html latex mpi.send text html latex mpi.send.Robj text html latex mpi.sendrecv text html latex example mpi.spawn.Rslaves text html latex mpi.universe.size text html latex ** building package indices ... * DONE (Rmpi) [sdavis at beowulf Rmpi]$ mpirun -np 1 R R : Copyright 2005, The R Foundation for Statistical Computing Version 2.1.0 (2005-04-18), ISBN 3-900051-07-0 R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under certain conditions. Type 'license()' or 'licence()' for distribution details. Natural language support but running in an English locale R is a collaborative project with many contributors. Type 'contributors()' for more information and 'citation()' on how to cite R or R packages in publications. Type 'demo()' for some demos, 'help()' for on-line help, or 'help.start()' for a HTML browser interface to help. Type 'q()' to quit R. > library('Rmpi',lib='~/R/library') Rmpi version: 0.4-9 Rmpi is an interface (wrapper) to MPI APIs with interactive R slave functionalities. See `library (help=Rmpi)' for details. unable to load shared library '/home/sdavis/R/library/Rmpi/libs/Rmpi.so': /home/sdavis/R/library/Rmpi/libs/Rmpi.so: cannot open shared object file: No such file or directory In addition: Warning message: Cannot start LAM/MPI. Exit in: f(libname, pkgname) Error in library("Rmpi", lib = "~/R/library") : .First.lib failed for 'Rmpi' Error in dyn.unload(x) : dynamic/shared library '/home/sdavis/R/library/Rmpi/libs/Rmpi.so' was not loaded > And the library file is there.... [sdavis at beowulf libs]$ ls -la -rwxr-xr-x 1 sdavis sdavis 46756 Jun 15 17:51 Rmpi.so [sdavis at beowulf libs]$ pwd /home/sdavis/R/library/Rmpi/libs