Configuring MPICH2 version 1.2.1p1 with  '--prefix=/home/user/mpich2-install'
Running on system: CYGWIN_NT-5.1 ibm-90bbe8a823d 1.7.5(0.225/5/3) 2010-04-12 19:07 i686 Cygwin
Executing mpich2prereq in /home/mpich2-1.2.1p1/src/mpid/ch3 with 
Executing mpich2prereq in /home/mpich2-1.2.1p1/src/mpid/ch3/channels/nemesis
sourcing /home/mpich2-1.2.1p1/src/pm/mpd/mpich2prereq
sourcing /home/mpich2-1.2.1p1/src/pm/hydra/mpich2prereq
sourcing /home/mpich2-1.2.1p1/src/pm/gforker/mpich2prereq
sourcing /home/mpich2-1.2.1p1/src/pm/mpd/setup_pm
checking for gcc... gcc
checking for C compiler default output file name... a.exe
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... .exe
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... /lib/cpp
configure: error: in `/home/mpich2-1.2.1p1':
configure: error: C preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details.