In this case we will only compile <TT>sander</TT>, not other parts of Amber7 suite. Those
can be compiled separately (without MPICH as they do not need it anyway).
If you tried to compile <TT>sander</TT> (cd $AMBERHOME/src/sander; make) you might encounter 
error similar to this:
<PRE>
...
SYSLIB=`../sysdir lib` ; ../Compile LOAD -o sander \
                sander.o cshf.o noecalc.o noeread.o caldis.o calrate.o dinten.o ...
pgf77 -o sander sander.o cshf.o noecalc.o noeread.o caldis.o calrate.o dinten.o ...
/usr/local/mpich/lib/libmpich.a(farg.o): In function `mpir_iargc__':
farg.o(.text+0x7): undefined reference to `f__xargc'
make: *** [sander] Error 1
</PRE>

An explanation of this error and a workaround is posted somewhere 
in FAQ section of <A HREF="http://www.pgroup.com/faq.htm">Portland 
Group website</A> (look for "How do I fix a ": undefined reference to 
`f__xargc'" problem?"). In short, create a file <A HREF="farg.f">farg.f</A> 
in $AMBERHOME/src/sander directory. Compile it with: 
<TT>pgf77 -c -Msecond_underscore farg.f</TT>. <BR>
Use MACHINE file provided below to compile and link sander executables.<BR>
<A HREF="Machine.pgf77_mpich.gcc">Machine/Machine.pgf77_mpich.gcc</A><BR>