| dnl A function to check for zlib availability.  zlib is used by default | 
 | dnl unless the user configured with --disable-nls. | 
 |  | 
 | AC_DEFUN([AM_ZLIB], | 
 | [ | 
 |   # See if the user specified whether he wants zlib support or not. | 
 |   AC_ARG_WITH(zlib, | 
 |     [  --with-zlib             include zlib support (auto/yes/no) [default=auto]], | 
 |     [], [with_zlib=auto]) | 
 |  | 
 |   if test "$with_zlib" != "no"; then | 
 |     AC_SEARCH_LIBS(zlibVersion, z, [AC_CHECK_HEADERS(zlib.h)]) | 
 |     if test "$with_zlib" = "yes" -a "$ac_cv_header_zlib_h" != "yes"; then | 
 |       AC_MSG_ERROR([zlib (libz) library was explicitly requested but not found]) | 
 |     fi | 
 |   fi | 
 | ]) | 
 |  |