source: code/archive/tutorialHS08/cmake/FindOpenAL.cmake

# - Locate OpenAL
# This module defines
#  OPENAL_LIBRARY
#  OPENAL_FOUND, if false, do not try to link to OpenAL
#  OPENAL_INCLUDE_DIR, where to find the headers
#
# $OPENALDIR is an environment variable that would
# correspond to the ./configure --prefix=$OPENALDIR
# used in building OpenAL.
#
# Several changes and additions by Fabian 'x3n' Landau
#                 > www.orxonox.net <

IF (OPENAL_LIBRARY AND OPENAL_INCLUDE_DIR)
  SET(OPENAL_FIND_QUIETLY TRUE)
ENDIF (OPENAL_LIBRARY AND OPENAL_INCLUDE_DIR)

# Created by Eric Wing. This was influenced by the FindSDL.cmake module.
# On OSX, this will prefer the Framework version (if found) over others.
# People will have to manually change the cache values of
# OPENAL_LIBRARY to override this selection.
# Tiger will include OpenAL as part of the System.
# But for now, we have to look around.
# Other (Unix) systems should be able to utilize the non-framework paths.
FIND_PATH(OPENAL_INCLUDE_DIR AL/al.h
  $ENV{OPENALDIR}/include
  ~/Library/Frameworks/OpenAL.framework/Headers
  /Library/Frameworks/OpenAL.framework/Headers
  /System/Library/Frameworks/OpenAL.framework/Headers # Tiger
  /usr/pack/openal-0.0.8-cl/include # Tardis specific hack
  /usr/local/include/
  /usr/local/include/OpenAL
  /usr/local/include
  /usr/include/
  /usr/include/OpenAL
  /usr/include
  /sw/include # Fink
  /sw/include/OpenAL
  /sw/include
  /opt/local/include # DarwinPorts
  /opt/local/include/OpenAL
  /opt/local/include
  /opt/csw/include # Blastwave
  /opt/csw/include/OpenAL
  /opt/csw/include
  /opt/include
  /opt/include/OpenAL
  /opt/include
  ../libs/openal-0.0.8/common/include
  )
# I'm not sure if I should do a special casing for Apple. It is
# unlikely that other Unix systems will find the framework path.
# But if they do ([Next|Open|GNU]Step?),
# do they want the -framework option also?
IF(${OPENAL_INCLUDE_DIR} MATCHES ".framework")
  STRING(REGEX REPLACE "(.*)/.*\\.framework/.*" "\\1" OPENAL_FRAMEWORK_PATH_TMP ${OPENAL_INCLUDE_DIR})
  IF("${OPENAL_FRAMEWORK_PATH_TMP}" STREQUAL "/Library/Frameworks"
      OR "${OPENAL_FRAMEWORK_PATH_TMP}" STREQUAL "/System/Library/Frameworks"
      )
    # String is in default search path, don't need to use -F
    SET (OPENAL_LIBRARY "-framework OpenAL" CACHE STRING "OpenAL framework for OSX")
  ELSE("${OPENAL_FRAMEWORK_PATH_TMP}" STREQUAL "/Library/Frameworks"
      OR "${OPENAL_FRAMEWORK_PATH_TMP}" STREQUAL "/System/Library/Frameworks"
      )
    # String is not /Library/Frameworks, need to use -F
    SET(OPENAL_LIBRARY "-F${OPENAL_FRAMEWORK_PATH_TMP} -framework OpenAL" CACHE STRING "OpenAL framework for OSX")
  ENDIF("${OPENAL_FRAMEWORK_PATH_TMP}" STREQUAL "/Library/Frameworks"
    OR "${OPENAL_FRAMEWORK_PATH_TMP}" STREQUAL "/System/Library/Frameworks"
    )
  # Clear the temp variable so nobody can see it
  SET(OPENAL_FRAMEWORK_PATH_TMP "" CACHE INTERNAL "")

ELSE(${OPENAL_INCLUDE_DIR} MATCHES ".framework")
  FIND_LIBRARY(OPENAL_LIBRARY
    NAMES openal al OpenAL32
    PATHS
    $ENV{OPENALDIR}/lib
    $ENV{OPENALDIR}/libs
    /usr/pack/openal-0.0.8-cl/i686-debian-linux3.1/lib
    /usr/local/lib
    /usr/lib
    /sw/lib
    /opt/local/lib
    /opt/csw/lib
    /opt/lib
    ../libs/openal-0.0.8/src/.libs
    )
ENDIF(${OPENAL_INCLUDE_DIR} MATCHES ".framework")

SET (OPENAL_FOUND "NO")

IF (OPENAL_LIBRARY AND OPENAL_INCLUDE_DIR)
  SET (OPENAL_FOUND "YES")
  IF (NOT OPENAL_FIND_QUIETLY)
    MESSAGE (STATUS "OpenAL was found.")
    IF (VERBOSE_FIND)
      MESSAGE (STATUS "  include path: ${OPENAL_INCLUDE_DIR}")
      MESSAGE (STATUS "  library path: ${OPENAL_LIBRARY}")
      MESSAGE (STATUS "  libraries:    openal al OpenAL32")
    ENDIF (VERBOSE_FIND)
  ENDIF (NOT OPENAL_FIND_QUIETLY)
ELSE (OPENAL_LIBRARY AND OPENAL_INCLUDE_DIR)
  IF (NOT OPENAL_INCLUDE_DIR)
    MESSAGE (SEND_ERROR "OpenAL include path was not found.")
  ENDIF (NOT OPENAL_INCLUDE_DIR)
  IF (NOT OPENAL_LIBRARY)
    MESSAGE (SEND_ERROR "OpenAL library was not found.")
  ENDIF (NOT OPENAL_LIBRARY)
ENDIF (OPENAL_LIBRARY AND OPENAL_INCLUDE_DIR)