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set(OPENGL_FOUND FALSE)
if (OPENGL_INCLUDE_DIR)
# in cache already
set(OPENGL_FOUND TRUE)
else (OPENGL_INCLUDE_DIR)
if(DEFINED MESA_PREFIX)
set(_MESA_PREFIX ${MESA_PREFIX})
elseif(DEFINED ENV{MESA_PREFIX})
set(_MESA_PREFIX $ENV{MESA_PREFIX})
else()
message(FATAL_ERROR "no MESA_PREFIX given or found in environment")
endif()
if(DEFINED _MESA_PREFIX)
set(OPENGL_INCLUDE_DIR "${_MESA_PREFIX}/include" CACHE PATH "Mesa include")
set(OPENGL_LIBRARY_DIR "${_MESA_PREFIX}/lib" CACHE PATH "Mesa lib")
set(OPENGL_gl_LIBRARY "${_MESA_PREFIX}/lib/libGL.so" CACHE PATH "Mesa gl lib")
set(OPENGL_glu_LIBRARY "${_MESA_PREFIX}/lib/libGLU.so" CACHE PATH "Mesa glu lib")
set(OPENGL_LIBRARIES ${_MESA_PREFIX}/lib/libGL.so ${_MESA_PREFIX}/lib/libGLU.so ${_MESA_PREFIX}/lib/libOSMesa.so CACHE PATH "Mesa libs")
set(OPENGL_FOUND TRUE)
message(STATUS "Found Mesa include dir: ${OPENGL_INCLUDE_DIR}")
message(STATUS "Found Mesa lib dir: ${OPENGL_LIBRARY_DIR}")
message(STATUS "Using Mesa libs: ${OPENGL_LIBRARIES}")
endif()
endif()
if(NOT OPENGL_FOUND)
message(FATAL_ERROR "no Mesa found, please provide the correct location with MESA_PREFIX")
endif()
mark_as_advanced (OPENGL_INCLUDE_DIR)
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