I&#39;m trying to install mpich-3.0rc1 on an ancient (RHEL4) machine and get this error.<br><br><div>Making all in tools/topo/hwloc/hwloc</div><div>make[3]: Entering directory `/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc&#39;</div>
<div>Making all in src</div><div>make[4]: Entering directory `/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/src&#39;</div><div>/bin/sh ../../../../../libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I../../../../../include -I../../../../../tools/topo/hwloc/hwloc/include/private/autogen -I../../../../../tools/topo/hwloc/hwloc/include/hwloc/autogen  -I/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include -I/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include -DHWLOC_INSIDE_LIBHWLOC -I/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include -I/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include  -I/work/parmod/mpich-3.0rc1/src/mpl/include -I/work/parmod/mpich-3.0rc1/src/mpl/include -I/work/parmod/mpich-3.0rc1/src/openpa/src -I/work/parmod/mpich-3.0rc1/src/openpa/src -I/work/parmod/mpich-3.0rc1/src/mpi/romio/include -fvisibility=hidden  -I/usr/include/libxml2   -fvisibility=hidden  -I/usr/include/libxml2      -O2  -MT traversal.lo -MD -MP -MF .deps/traversal.Tpo -c -o traversal.lo traversal.c</div>
<div>libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../../../../../include -I../../../../../tools/topo/hwloc/hwloc/include/private/autogen -I../../../../../tools/topo/hwloc/hwloc/include/hwloc/autogen -I/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include -I/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include -DHWLOC_INSIDE_LIBHWLOC -I/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include -I/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include -I/work/parmod/mpich-3.0rc1/src/mpl/include -I/work/parmod/mpich-3.0rc1/src/mpl/include -I/work/parmod/mpich-3.0rc1/src/openpa/src -I/work/parmod/mpich-3.0rc1/src/openpa/src -I/work/parmod/mpich-3.0rc1/src/mpi/romio/include -fvisibility=hidden -I/usr/include/libxml2 -fvisibility=hidden -I/usr/include/libxml2 -O2 -MT traversal.lo -MD -MP -MF .deps/traversal.Tpo -c traversal.c  -fPIC -DPIC -o .libs/traversal.o</div>
<div>In file included from traversal.c:12:</div><div>/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/include/private/misc.h:41:2: error: #error &quot;unknown size for unsigned int.&quot;</div><div>make[4]: *** [traversal.lo] Error 1</div>
<div>make[4]: Leaving directory `/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc/src&#39;</div><div>make[3]: *** [all-recursive] Error 1</div><div>make[3]: Leaving directory `/work/parmod/mpich-3.0rc1/src/pm/hydra/tools/topo/hwloc/hwloc&#39;</div>
<div>make[2]: *** [all-recursive] Error 1</div><div>make[2]: Leaving directory `/work/parmod/mpich-3.0rc1/src/pm/hydra&#39;</div><div>make[1]: *** [all-recursive] Error 1</div><div>make[1]: Leaving directory `/work/parmod/mpich-3.0rc1&#39;</div>
<div>make: *** [all] Error 2</div><div><br><br></div><div>It wasn&#39;t obvious to me from the logs why this was being tripped. Configure log attached.</div>