Cmake package 'gl' not found

[Noah-Huppert]

I have a CMake project that adds GLEW as an external project

externalProject_add(glew
    GIT_REPOSITORY https://github.com/nigels-com/glew.git
    GIT_TAG glew-1.12.0
    SOURCE_DIR build/cmake
    INSTALL_DIR ${glew_INSTALL_DIR})

When I go to build with Make I get this error

[  5%] Performing update step for 'glew'
[ 11%] Performing configure step for 'glew'
-- checking for module 'gl'
--   package 'gl' not found

This is odd because I know I have OpenGL

$ ~ glxinfo | grep gl
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
    GL_ARB_texture_rectangle, GL_ARB_texture_storage, GL_ARB_texture_swizzle, 
    GL_EXT_texture_lod_bias, GL_EXT_texture_object, GL_EXT_texture_rectangle, 
    GL_NV_texture_env_combine4, GL_NV_texture_rectangle, GL_OES_EGL_image,

$ ~ glxinfo | grep '^direct rendering:'
direct rendering: Yes

[Noah-Huppert]

OS: Ubuntu 14.04 x64
Cmake: cmake version 3.3.0-rc3

[tamaskenez]

The CMake support in 1.12.0 was a bit immature. It has been rewritten since. Can you try the HEAD instead? It finds OpenGL with the proper CMake module instead of pkgconfig.

[Noah-Huppert]

If I remove the GIT_TAG option:

externalProject_add(glew
    GIT_REPOSITORY https://github.com/nigels-com/glew.git
    SOURCE_DIR build/cmake
    INSTALL_DIR ${glew_INSTALL_DIR})

and build I then get this error:

$ make
$ make
[  5%] Performing update step for 'glew'
Ignoring path auto/registry/
Current branch master is up to date.
[ 11%] Performing configure step for 'glew'
CMake Error: The source directory "/home/noah/Documents/glib/build/glew-prefix/src/glew" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
make[2]: *** [glew-prefix/src/glew-stamp/glew-configure] Error 1
make[1]: *** [CMakeFiles/glew.dir/all] Error 2
make: *** [all] Error 2

[Noah-Huppert]

On a hunch I tried running make in the auto directory( #13 ) but that did not fix it

[tamaskenez]

Now the problem is that ExternalProject thinks the source directory is the root of the GLEW repo, instead of the build/cmake subdirectory. Despite you correctly specified the SOURCE_DIR option.

[Noah-Huppert]

Woops forgot to update that. I removed the source dir option from external project

[Noah-Huppert]

Just tweeked a couple things in the external project and it worked

externalProject_add(glew
    GIT_REPOSITORY https://github.com/nigels-com/glew.git

    CONFIGURE_COMMAND make extensions

    BUILD_IN_SOURCE true
    BUILD_COMMAND make

    INSTALL_DIR ${glew_INSTALL_DIR}
    INSTALL_COMMAND sudo make install && sudo make clean)