set(MATHGL_PREFIX "" CACHE PATH "The path to the prefix of an MathGL installation")

find_path(MATHGL_INCLUDE_DIR NAMES mgl2/mgl.h
  PATHS
  ${MATHGL_PREFIX}/include
  /opt/local/include
  /usr/include
  /usr/local/include
)

find_library(MATHGL_LIBRARIES NAMES mgl mgl2
  PATHS
  ${MATHGL_PREFIX}/lib
  /opt/local/lib
  /usr/lib
  /usr/local/lib
)

find_library(MATHGL_QT5_LIBRARIES NAMES mgl-qt5 mgl2-qt5
  PATHS
  ${MATHGL_PREFIX}/lib
  /opt/local/lib
  /usr/lib
  /usr/local/lib
)

if(MATHGL_INCLUDE_DIR AND MATHGL_LIBRARIES AND
   NOT TARGET MathGL::Mgl AND NOT TARGET MathGL::Qt5)
  get_filename_component(MATHGL_LIBRARY_DIR ${MATHGL_LIBRARIES} PATH)
  set(MATHGL_FOUND TRUE)
  add_library(MathGL::Mgl INTERFACE IMPORTED)
  set_target_properties(MathGL::Mgl PROPERTIES
      INTERFACE_INCLUDE_DIRECTORIES "${MATHGL_INCLUDE_DIR}"
      INTERFACE_LINK_LIBRARIES "${MATHGL_LIBRARIES}"
  )
  add_library(MathGL::Qt5 INTERFACE IMPORTED)
  set_target_properties(MathGL::Qt5 PROPERTIES
    INTERFACE_INCLUDE_DIRECTORIES "${MATHGL_INCLUDE_DIR}"
    INTERFACE_LINK_LIBRARIES "${MATHGL_QT5_LIBRARIES}"
)
endif()

if(MATHGL_FOUND)
  if(NOT MATHGL_FIND_QUIETLY)
    MESSAGE(STATUS "Found MathGL: ${MATHGL_LIBRARIES}")
  endif()
  set(HAVE_MATHGL 1)
elseif(MATHGL_FOUND)
  if(MATHGL_FIND_REQUIRED)
    message(FATAL_ERROR "Could not find MATHGL")
  endif()
endif()