File: zlib.m4

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dnl A function to check if the system's zlib library should be used.  The
dnl builtin zlib dnl is used by default unless the user configured with
dnl --with-system-zlib.

AC_DEFUN([AM_ZLIB],
[
  # Use the system's zlib library.
  zlibdir="-L\$(top_builddir)/../zlib"
  zlibinc="-I\$(top_srcdir)/../zlib"
  AC_ARG_WITH(system-zlib,
  [AS_HELP_STRING([--with-system-zlib], [use installed libz])],
  if test x$with_system_zlib = xyes ; then
    zlibdir=
    zlibinc=
  fi
  )
  AC_SUBST(zlibdir)
  AC_SUBST(zlibinc)
])