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... Use Fortran to link programs checking whether Fortran 77 and C objects are compatible... yes checking for Fortran 77 name mangling... lower underscore checking what libraries are needed to link Fortran programs with C routines that use stdio... none checking whether Fortran init will work with C... yes checking for f90... no checking for xlf90... no checking for pgf90... no checking for ifort... no checking for epcf90... no checking for f95... no checking for fort... no checking for xlf95... no checking for lf95... no checking for pathf95... no checking for pathf90... no checking for g95... no checking for gfortran... gfortran checking that f works as the extension for Fortran 90 program... yes checking whether we are using the GNU Fortran 90 compiler... yes checking whether gfortran accepts -g... yes checking for extension for Fortran 90 programs... f90 checking whether the Fortran 90 compiler (gfortran ) works... yes checking whether the Fortran 90 compiler (gfortran ) is a cross-compiler... no checking whether Fortran 90 works with Fortran 77... yes checking whether Fortran accepts ! for comments... yes checking for include directory flag for Fortran... -I checking for Fortran 77 flag for library directories... `-L checking for which Fortran libraries are needed to link C with Fortran... none checking whether Fortran compiler processes .F files with C preprocessor... yes checking that f works as the extension for Fortran 90 program... yes checking whether we are using the GNU Fortran 90 compiler... (cached) yes checking whether gfortran accepts -g... 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VPATH checking whether make sets CFLAGS... no checking for bash... /Users/fisher/bin/bash checking whether /Users/fisher/bin/bash supports arrays... yes checking for doctext... false checking for location of doctext style files... unavailable checking for an ANSI C-conforming const... yes checking for working volatile... yes checking for C/C++ restrict keyword... __restrict checking for inline... inline checking whether __attribute__ allowed... yes checking whether __attribute__((format)) allowed... yes checking whether byte ordering is bigendian... no checking whether C compiler allows unaligned doubles... yes checking whether gcc supports __func__... yes Using gcc to determine dependencies checking whether long double is supported... yes checking whether long long is supported... yes checking for max C struct integer alignment... eight checking for max C struct floating point alignment... sixteen checking for max C struct alignment of structs with doubles... eight checking for max C struct floating point alignment with long doubles... sixteen configure: WARNING: Structures containing long doubles may be aligned differently from structures with floats or longs. MPICH2 does not handle this case automatically and you should avoid assumed extents for structures containing float types. checking if alignment of structs with doubles is based on position... no checking if alignment of structs with long long ints is based on position... no checking if double alignment breaks rules, find actual alignment... no checking for alignment restrictions on pointers... int or better checking size of char... 1 checking size of unsigned char... 1 checking size of short... 2 checking size of unsigned short... 2 checking size of int... 4 checking size of unsigned int... 4 checking size of long... 8 checking size of unsigned long... 8 checking size of long long... 8 checking size of unsigned long long... 8 checking size of float... 4 checking size of double... 8 checking size of long double... 16 checking size of void *... 8 checking for ANSI C header files... no checking stddef.h usability... yes checking stddef.h presence... yes checking for stddef.h... yes checking size of wchar_t... 4 checking size of float_int... 8 checking size of double_int... 16 checking size of long_int... 16 checking size of short_int... 8 checking size of two_int... 8 checking size of long_double_int... 32 checking sys/bitypes.h usability... no checking sys/bitypes.h presence... no checking for sys/bitypes.h... no checking inttypes.h usability... yes checking inttypes.h presence... yes checking for inttypes.h... yes checking stdint.h usability... yes checking stdint.h presence... yes checking for stdint.h... yes checking for int8_t... yes checking for int16_t... yes checking for int32_t... yes checking for int64_t... yes checking for uint8_t... yes checking for uint16_t... yes checking for uint32_t... yes checking for uint64_t... yes checking size of _Bool... 1 checking size of float _Complex... 8 checking size of double _Complex... 16 checking size of long double _Complex... 32 checking for _Bool... yes checking for float _Complex... yes checking for double _Complex... yes checking for long double _Complex... yes checking for size of Fortran type integer... 4 checking for size of Fortran type real... 4 checking for size of Fortran type double precision... 8 checking whether integer*1 is supported... yes checking whether integer*2 is supported... yes checking whether integer*4 is supported... yes checking whether integer*8 is supported... yes checking whether integer*16 is supported... yes checking whether real*4 is supported... yes checking whether real*8 is supported... yes checking whether real*16 is supported... yes checking for C type matching Fortran integer... int checking for size of MPI_Status... 20 checking for values of Fortran logicals... True is 1 and False is 0 checking for Fortran 90 integer kind for 8-byte integers... 8 checking whether real*8 is supported in Fortran 90... yes checking size of bool... 1 checking how to run the C++ preprocessor... c++ -E checking complex usability... yes checking complex presence... yes checking for complex... yes checking size of Complex... 8 checking size of DoubleComplex... 16 checking size of LongDoubleComplex... 32 checking if char * pointers use byte addresses... yes checking for alignment restrictions on ... no checking for alignment restrictions on int32_t... no checking size of MPIR_Bsend_data_t... 88 checking for gcc __asm__ and pentium cmpxchgl instruction... no checking for gcc __asm__ and AMD x86_64 cmpxchgq instruction... yes checking for gcc __asm__ and IA64 xchg4 instruction... no checking for ANSI C header files... (cached) no checking stdlib.h usability... yes checking stdlib.h presence... yes checking for stdlib.h... yes checking stdarg.h usability... yes checking stdarg.h presence... yes checking for stdarg.h... yes checking sys/types.h usability... yes checking sys/types.h presence... yes checking for sys/types.h... yes checking string.h usability... yes checking string.h presence... yes checking for string.h... yes checking for inttypes.h... (cached) yes checking limits.h usability... yes checking limits.h presence... yes checking for limits.h... yes checking for stddef.h... 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