[CMake] ExternalProject_Add : set the location of CMakeLists.txt

[Benjamin Ballet]

Hi,

I'm trying to get GLEW (https://github.com/nigels-com/glew) with
ExternalProject_Add
It's buildable with cmake but the CMakeLists.txt is in build/cmake
directory.

Is there a way to specify the directory of the CMakeLists.txt file ?

If I change SOURCE_DIR it will only clone the repo in SOURCE_DIR and still
run the cmake command in repo root.

-- 
*Benjamin BALLET*
Ingénieur R&D

*ACTIVISU*
19, rue Klock - 92110 Clichy
*> Standard Tél* :  01 44 69 37 37
*>* www.activisu.com
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