I try to compile Eigen. When I use CMake to generate Makefile, encounter this error:

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
GLUT_Xmu_LIBRARY (ADVANCED)
linked by target "openglsupport" in directory /home/mingfeideng/workdir/eigen/eigen-eigen-ce5a455b34c0/unsupported/test

I check the /unsupported/test/CMakeLists.txt , found the error generate by this code

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  if(OPENGL_FOUND AND GLUT_FOUND AND GLEW_FOUND)
    include_directories(${OPENGL_INCLUDE_DIR} ${GLUT_INCLUDE_DIR} ${GLEW_INCLUDE_DIRS})
    ei_add_property(EIGEN_TESTED_BACKENDS "OpenGL, ")
    set(EIGEN_GL_LIB ${GLUT_LIBRARIES} ${GLEW_LIBRARIES} ${OPENGL_LIBRARIES})
    ei_add_test(openglsupport  "" "${EIGEN_GL_LIB}" )
  else()
    ei_add_property(EIGEN_MISSING_BACKENDS "OpenGL, ")
  endif()

if I modify the code as below, the error will gone, but if compile in this way Eigen maybe not support OpenGL.

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ei_add_property(EIGEN_MISSING_BACKENDS "OpenGL, ")

Is there someone know how to fix this problem in right way?

Eigen is header only, so there is nothing to configure/compile to use Eigen. The cmake build scripts are only for building the unit tests and the documentation. (and also to provide a "make install" copying the header files.).

You can bypass OpenGL cheking with cmake -DEIGEN_TEST_NO_OPENGL=OFF.

The origin of your problem seems to come from the FindGLUT.cmake cmake module which defines GLUT_FOUND to true whereas some of its dependencies are missing.

See also: http://ubuntuforums.org/showthread.php?t=1703770