[CMake] force to install doxygen each time

[Cristobal Navarro]

hello,

i was reading this tutorial about integrating doxygen documentation into the
cmake build process.

http://invalidmagic.wordpress.com/2009/11/30/cmake-and-doxygen-github-com/

is found it really cool because the doxyconf file feeds from some cmake
variables i set, letting me handle version information on a single file.

my problem is that when i made some modifications to the source comments,
the updated documentation didnt install
because it said "up-to-date"
i would like cmake to force the instalation of the generated doxy-files
(even make sure that cmake is waiting for doxygen to finnish before
installing)
is there a way to accomplish this?

thanks and
best regards
Cristobal
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