config/zlib.m4

   1 dnl A function to check for zlib availability.  zlib is used by default
   2 dnl unless the user configured with --disable-nls.
   3
   4 AC_DEFUN([AM_ZLIB],
   5 [
   6   # See if the user specified whether he wants zlib support or not.
   7   AC_ARG_WITH(zlib,
   8     [  --with-zlib             include zlib support (auto/yes/no) [default=auto]],
   9     [], [with_zlib=auto])
  10
  11   if test "$with_zlib" != "no"; then
  12     AC_SEARCH_LIBS(zlibVersion, z, [AC_CHECK_HEADERS(zlib.h)])
  13     if test "$with_zlib" = "yes" -a "$ac_cv_header_zlib_h" != "yes"; then
  14       AC_MSG_ERROR([zlib (libz) library was explicitly requested but not found])
  15     fi
  16   fi
  17 ])
  18