# - Try to find BZip2
# Once done this will define
#
#  BZIP2_FOUND - system has BZip2
#  BZIP2_INCLUDE_DIR - the BZip2 include directory
#  BZIP2_LIBRARIES - Link these to use BZip2
#  BZIP2_DEFINITIONS - Compiler switches required for using BZip2
#  BZIP2_NEED_PREFIX - this is set if the functions are prefixed with BZ2_


IF (CACHED_BZIP2)

  # in cache already
  IF ("${CACHED_BZIP2}" STREQUAL "YES")
    SET(BZIP2_FOUND TRUE)
  ENDIF ("${CACHED_BZIP2}" STREQUAL "YES")

ELSE (CACHED_BZIP2)

  FIND_PATH(BZIP2_INCLUDE_DIR bzlib.h
    /usr/include
    /usr/local/include
  )
  
  FIND_LIBRARY(BZIP2_LIBRARIES NAMES bz2 bzip2
    PATHS
    /usr/lib
    /usr/local/lib
  )
  
  if (BZIP2_INCLUDE_DIR AND BZIP2_LIBRARIES)
     set(BZIP2_FOUND TRUE)
     INCLUDE(CheckLibraryExists)
     CHECK_LIBRARY_EXISTS(${BZIP2_LIBRARIES} BZ2_bzCompressInit "" BZIP2_NEED_PREFIX)
     set(CACHED_BZIP2 "YES")
  else (BZIP2_INCLUDE_DIR AND BZIP2_LIBRARIES)
     set(CACHED_BZIP2 "NO")
  endif (BZIP2_INCLUDE_DIR AND BZIP2_LIBRARIES)
  
  if (BZIP2_FOUND)
    if (NOT BZip2_FIND_QUIETLY)
      message(STATUS "Found BZip2: ${BZIP2_LIBRARIES}")
    endif (NOT BZip2_FIND_QUIETLY)
  else (BZIP2_FOUND)
    if (BZip2_FIND_REQUIRED)
      message(FATAL_ERROR "Could NOT find BZip2")
    endif (BZip2_FIND_REQUIRED)
  endif (BZIP2_FOUND)
  
  set(CACHED_BZIP2 ${CACHED_BZIP2} CACHE INTERNAL "If bzip2 was checked")
  MARK_AS_ADVANCED(BZIP2_INCLUDE_DIR BZIP2_LIBRARIES)

ENDIF( CACHED_BZIP2 )