Hi, I am trying to make cmake reconfigure whenever a certain file is touched.  
This is because the file ends up listing out a set of directories that need to 
be built during the build.  Currently I do a trick where I use configure file 
to write out a file that will never be used but causes the input file to 
trigger reconfigures.
For example:

configure_file( file_i_care_about.txt 
${CMAKE_CURRENT_BINARY_DIR}/tmp_file_that_isn't_used.txt )

Is there another recommended way or is this the best approach.  I have tried 
searching for this but haven't found anything on it yet.

-Kris

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