[CMake] Find executable a test it's version

[pepone.onrez]

Hello all
I'm new cmake user and need to write a module for test if a pacakage exists,
In my case i need to check If Ice (Internet Communication Engine |
http://www.zeroc.com) is installed, this package is a set of shared
libraries,  include files, and compilers for slice language.

I need to be able of check if  the slice compiler executable exists, and
check the version with the -v argument of the compiler

Here is a pseudo code of what i trying to do

ICE_VERSION="3.2.2"
ICE_FOUND="False"
#Search the slice2cpp compiler

SLICE2CPP = SEARCH_EXECUTABLE(slice2cpp /usr/bin)
if(SLICE2CPP)
   if(SLICE2CPP  -v == $ICE_VERSION)
      ICE_FOUND="True"
   endif
endif

Any ideas for this task
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