INCLUDE(FindHelpers)
FIND_PACKAGE_HELPER(Vorbis vorbisenc.h)
FIND_PACKAGE_HELPER(VorbisFile vorbisfile.h SUFFIXES vorbis)
IF(VORBISFILE_FOUND)
SET(VORBIS_LIBRARIES ${VORBIS_LIBRARIES} ${VORBISFILE_LIBRARIES})
ENDIF()