[CMake] FIND_PROGRAM Version

[hsanson]

I use FIND_PROGRAM to find a grammar parser (ragel) to generate some 
source files needed for my project. The problem is that the way ragel is 
called (arguments) is different for each mayor version. I need to get 
the program mayor version 5.x or 6.x and then set the ADD_COMMAND 
arguments accordingly but I have not found a portable way (works in 
linux and windows) way to do this.

Does CMake has something like FIND_PROGRAM but that accepts or provides 
the program version information??


thanks
Horacio
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