On tg-login2.uc.teragrid.org, I encountered the following error when building
GT4.0.1-r3b against an MPICH2 1.0.3 installation created using gcc.  I also
encounter the same error when building GT4.0.1 on smash.mcs.anl.gov, so the
problem is not specific to the TeraGrid login node.

/home/toonen/p/mpich2-gcc/bin/mpicc -DHAVE_CONFIG_H -I.
-I/home/toonen/p/gt4.0.1-r3b-all-source-installer/source-trees-thr/common/so
urce/library -I.. -I.
-I/home/toonen/p/gt4.0.1-r3b-gcc-mpich2/include/mpicc64dbgpthr
-I/home/toonen/p/gt4.0.1-r3b-gcc-mpich2/include
-I/home/toonen/p/gt4.0.1-r3b-gcc-mpich2/include/mpicc64dbgpthr -g -Wall -c
globus_debug.c  -fPIC -DPIC -o .libs/globus_debug.o
globus_debug.c:19: parse error before "__extension__"
globus_debug.c:19: `__len' undeclared here (not in a function)
globus_debug.c:19: initializer element is not constant
globus_debug.c:19: parse error before "if"
globus_debug.c:19: warning: type defaults to `int' in declaration of `__retval'
globus_debug.c:19: conflicting types for `__retval'
globus_debug.c:19: previous declaration of `__retval'
globus_debug.c:19: warning: data definition has no type or storage class
globus_debug.c:19: parse error before '}' token

Commenting out line 19, which is a declaration for the strdup() function, fixes
the problem.  The problem is that /usr/include/bits/string2.h, which is included
by /usr/include/string.h, defines strdup as a macro.