You're building a 5 year old version of MPICH (1.2.1p1). Can you try again with something a little more recent? The latest stable version is 3.2.1. On Feb 18, 2018, at 10:36 AM, Dennis Fisher <[email protected]<mailto:[email protected]>> wrote: Dear MPICH team I am trying to install MPICH2 in OS X (High Sierra; XCODE and Command Line Tools both installed). The installation proceeds per the output below until it reports: configure: error: Requested timer clock_gettime (POSIX) is not available Full output appended below. Unfortunately, the MPICH2 Installer’s Guide does not provide any instructions for how to deal with this, with the exception of: Problems should be self-explanatory, but if not, send c.txt to [email protected]<mailto:[email protected]> It appears that the message is coming from ~ line 37903 of the configure script. Can you direct me? The command that I executed was: ./configure -prefix=/opt/mpich2-install & tee c.txt I also tried (same result): ./configure -prefix=/opt/mpich2-install --enable-sharedlibs=osx-gcc & tee c.txt Dennis Dennis Fisher MD P < (The "P Less Than" Company) Phone / Fax: 1-866-PLessThan (1-866-753-7784) www.PLessThan.com<http://www.plessthan.com/> PET694> ./configure -prefix=/opt/mpich2-install & tee c.txt [2] 56222 Configuring MPICH2 version 1.2.1p1 with '-prefix=/opt/mpich2-install' Running on system: Darwin Denniss-iMac.local 17.4.0 Darwin Kernel Version 17.4.0: Sun Dec 17 09:19:54 PST 2017; root:xnu-4570.41.2~1/RELEASE_X86_64 x86_64 Executing mpich2prereq in /opt/mpich2-1.2.1p1/src/mpid/ch3 with Executing mpich2prereq in /opt/mpich2-1.2.1p1/src/mpid/ch3/channels/nemesis sourcing /opt/mpich2-1.2.1p1/src/pm/mpd/mpich2prereq sourcing /opt/mpich2-1.2.1p1/src/pm/hydra/mpich2prereq sourcing /opt/mpich2-1.2.1p1/src/pm/gforker/mpich2prereq sourcing /opt/mpich2-1.2.1p1/src/pm/mpd/setup_pm checking for gcc... gcc checking for C compiler default output file name... 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 ISO C89... none needed checking how to run the C preprocessor... gcc -E checking whether the compiler defines __func__... yes checking whether the compiler defines __FUNC__... no checking whether the compiler sets __FUNCTION__... yes checking whether C compiler accepts option -O2... yes checking whether routines compiled with -O2 can be linked with ones compiled without -O2... yes checking for type of weak symbol alias support... no checking whether __attribute__ ((weak)) allowed... yes checking whether __attribute ((weak_import)) allowed... yes checking for g77... no checking for xlf... no checking for f77... no checking for frt... no checking for pgf77... no checking for cf77... no checking for fort77... no checking for fl32... no checking for af77... no checking for xlf90... no checking for f90... no checking for pgf90... no checking for pghpf... no checking for epcf90... no checking for gfortran... gfortran checking whether we are using the GNU Fortran 77 compiler... yes checking whether gfortran accepts -g... yes checking whether Fortran 77 compiler accepts option -O2... yes checking whether routines compiled with -O2 can be linked with ones compiled without -O2... yes checking how to get verbose linking output from gfortran... -v checking for Fortran 77 libraries of gfortran... -L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin16/6.3.0 -L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin16/6.3.0/../../.. -lgfortran -lquadmath -lm checking whether gfortran accepts the FLIBS found by autoconf... yes checking whether C can link with -L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin16/6.3.0 -L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin16/6.3.0/../../.. -lgfortran -lquadmath -lm... yes checking for linker for Fortran main programs... 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