cmake HAVE_LIBATTR examples

libarchive/libarchive CMakeLists.txt :1827 

CHECK_LIBRARY_EXISTS(attr "setxattr" "" HAVE_LIBATTR)

libarchive/libarchive CMakeLists.txt :1834 

ELSE(HAVE_LIBATTR)

libarchive/libarchive CMakeLists.txt :1840 

ENDIF(HAVE_LIBATTR)