SET(GRASS_PREFIX "/usr" CACHE PATH "Path to GRASS base directory")
 

FIND_PATH(GRASS_INCLUDE_DIR grass/gis.h ${GRASS_PREFIX}/include)

SET (GRASS_LIB_NAMES gis vect dig2 dbmiclient dbmibase shape dgl rtree datetime linkm form gproj)

SET (GRASS_LIBRARIES "")

FOREACH (LIB ${GRASS_LIB_NAMES})
  SET(LIB_PATH NOTFOUND)
  FIND_LIBRARY(LIB_PATH grass_${LIB} PATHS ${GRASS_PREFIX}/lib)

  IF (LIB_PATH)
    IF (NOT GRASS_LIBRARIES STREQUAL NOTFOUND)
      SET (GRASS_LIBRARIES ${GRASS_LIBRARIES} ${LIB_PATH})
    ENDIF (NOT GRASS_LIBRARIES STREQUAL NOTFOUND)
  ELSE (LIB_PATH)
    SET (GRASS_LIBRARIES NOTFOUND)
  ENDIF (LIB_PATH)

ENDFOREACH (LIB)

IF (GRASS_INCLUDE_DIR AND GRASS_LIBRARIES)
   SET(GRASS_FOUND TRUE)
ENDIF (GRASS_INCLUDE_DIR AND GRASS_LIBRARIES)


IF (GRASS_FOUND)

   IF (NOT GRASS_FIND_QUIETLY)
      MESSAGE(STATUS "Found GRASS: ${GRASS_PREFIX}")
   ENDIF (NOT GRASS_FIND_QUIETLY)

  # openpty is currently needed for GRASS shell
  INCLUDE(CheckFunctionExists)
  SET (CMAKE_REQUIRED_INCLUDES pty.h)
  SET (CMAKE_REQUIRED_LIBRARIES util)
  CHECK_FUNCTION_EXISTS(openpty HAVE_OPENPTY)

  # add 'util' library to the dependencies
  IF (HAVE_OPENPTY)
    FIND_LIBRARY(OPENPTY_LIBRARY NAMES util PATH /usr/local/lib /usr/lib)
    SET (GRASS_LIBRARIES ${GRASS_LIBRARIES} ${OPENPTY_LIBRARY})
  ENDIF (HAVE_OPENPTY)

ELSE (GRASS_FOUND)

   IF (GRASS_FIND_REQUIRED)
      MESSAGE(FATAL_ERROR "Could not find GRASS")
   ELSE (GRASS_FIND_REQUIRED)
      MESSAGE(STATUS "Could not find GRASS")
   ENDIF (GRASS_FIND_REQUIRED)

ENDIF (GRASS_FOUND)