Compile Open MPI

Hi to all,
I try to compile Open MPI with cygwin after non successes with mingw,
I download cygwin with cmake (it not with default download).
and i try to compile openmpi with it.
i configure (with windows variable) that i can use cmake (and other linux command of cygwin) with cmd.
I open cmd i push this command:
C:\cygwin>cmake openmpi-1.4.5

and it give me an error.

CMake Error at CMakeLists.txt:17 (MESSAGE):
Only support Windows. Aborting.

-- Configuring incomplete, errors occurred!
CMake Error: Unable to open cache file for save. //CMakeCache.txt
CMake Error: : System Error: Is a directory

i am using cmake version 2.8.4.
i am download the source code from here:
http://www.open-mpi.org/software/ompi/v1.4/
http://www.open-mpi.org/software/ompi/v1.4/downloads/openmpi-1.4.5.tar.gz

i am using win7 64bit. but compile with cygwin and mingw 32bit.

i want to make Open MPI portable that it will
run with gcc of mingw or cygwin. (and not ls at windows build).

can anyone help me (and give me a links, and guide, and pictures)
to compile it with gcc?

thank you for your help.
Tal.