option('gl_api', type : 'array', choices : ['opengl', 'gles2', 'auto'], value : ['auto'],
description : 'A comma separated list of opengl APIs to enable building against')
option('gl_platform', type : 'array',
choices : ['glx', 'egl', 'cgl', 'wgl', 'eagl', 'auto'], value : ['auto'],
description : 'A comma separated list of opengl platforms to enable building against')
option('gl_winsys', type : 'array',
option('gl_api', type : 'array', choices : ['opengl', 'gles2', 'auto'], value : ['auto'],
description : 'A comma separated list of opengl APIs to enable building against')
option('gl_platform', type : 'array',
choices : ['glx', 'egl', 'cgl', 'wgl', 'eagl', 'auto'], value : ['auto'],
description : 'A comma separated list of opengl platforms to enable building against')
option('gl_winsys', type : 'array',