Dear everyone, I am installing mpich3.1 with Intel parallel_studio_xe_2011_sp1_update3 (ifort12). My configure is #./configure --prefix=/usr/local/mpich_intel CC=icc CXX=icpc F77=ifort FC=ifort --enable-threads=multiple --with-pm=mpd:hydra 2>&1 | tee c.txt Which completed successfully. But when I make, finally I got following errors: /home/weitong/setup/mpich-3.1/src/pm/hydra/tools/topo/hwloc/hwloc/include/private/misc.h(28): catastrophic error: #error directive: "unknown size for unsigned int." #error "unknown size for unsigned int." ^ compilation aborted for traversal.c (code 4) make[4]: *** [traversal.lo] error 1 make[4]: Leaving directory `/home/weitong/setup/mpich-3.1/src/pm/hydra/tools/topo/hwloc/hwloc/src' make[3]: *** [all-recursive] error 1 make[3]: Leaving directory `/home/weitong/setup/mpich-3.1/src/pm/hydra/tools/topo/hwloc/hwloc' make[2]: *** [all-recursive] error 1 make[2]: Leaving directory `/home/weitong/setup/mpich-3.1/src/pm/hydra' make[1]: *** [all-recursive] error 1 make[1]: Leaving directory `/home/weitong/setup/mpich-3.1' make: *** [all] 错误 2 PS: I also tried "mpich-master-v3.1-137-gb912961f", the same errors during make. Any solutions? Best, Wei Tong