Hi, today I tried to install mpich-master-v3.1.1-71-gc244ba49 on my Linux machine (openSUSE 12.1 x86_64). "make" fails with the following error for gcc-4.9.0. ... CC src/mpi/attr/lib_libmpi_la-attr_delete.lo In file included from ../mpich-master-v3.1.1-71-gc244ba49/src/mpi/attr/attr_delete.c:8:0: ../mpich-master-v3.1.1-71-gc244ba49/src/include/mpiimpl.h:105:12: error: unknown type name 'useconds_t' int usleep(useconds_t usec); ^ make[2]: *** [src/mpi/attr/lib_libmpi_la-attr_delete.lo] Error 1 ... I used the following configure-command. ../mpich-master-v3.1.1-71-gc244ba49/configure \ --prefix=/usr/local/mpich-3.1.2_64_gcc \ --libdir=/usr/local/mpich-3.1.2_64_gcc/lib64 \ --includedir=/usr/local/mpich-3.1.2_64_gcc/include64 \ CC="gcc" CXX="g++" F77="gfortran" FC="gfortran" \ CFLAGS="-m64 -std=c11" CXXFLAGS="-m64" FFLAGS="-m64" FCFLAGS="-m64" \ LDFLAGS="-m64" \ --enable-f77 --enable-fc --enable-cxx --enable-romio \ --enable-debuginfo --enable-smpcoll \ --enable-threads=runtime --with-thread-package=posix \ --enable-shared \ |& tee log.configure.$SYSTEM_ENV.$MACHINE_ENV.64_gcc The log-file contains no errors, but some warnings. linpc1 mpich-3.1.2-Linux.x86_64.64_gcc 118 grep -i warning \ log.configure.Linux.x86_64.64_gcc configure: WARNING: Some versions of gcc do not include debugging information configure: WARNING: Structures containing long doubles may be aligned differently from structures with floats or longs. MPICH does not handle this case automatically and you should avoid assumed extents for structures containing float types. configure: WARNING: File locks may not work with NFS. See the Installation and configure: WARNING: "-fvisibility=hidden" has been added to the hwloc CFLAGS checking warnings... no configure: WARNING: The ch3 device did not set the maximum size of an error string, 512 being used. config.status: WARNING: '../mpich-master-v3.1.1-71-gc244ba49/src/packaging/envmods/mpich.module.in' seems to ignore the --datarootdir setting linpc1 mpich-3.1.2-Linux.x86_64.64_gcc 119 I would be grateful if somebody could fix the problem. Thank you very much for your help in advance. Kind regards Siegmar