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dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/check_zlib.html
dnl
AC_DEFUN([CHECK_ZLIB],
#
# Handle user hints
#
[AC_MSG_CHECKING(if zlib is wanted)
AC_ARG_WITH(zlib,
[ --with-zlib=DIR root directory path of zlib installation [defaults to
/usr/local or /usr if not found in /usr/local]
--without-zlib to disable zlib usage completely],
[if test "$withval" != no ; then
AC_MSG_RESULT(yes)
ZLIB_HOME="$withval"
else
AC_MSG_RESULT(no)
fi], [
AC_MSG_RESULT(yes)
ZLIB_HOME=/usr/local
if test ! -f "${ZLIB_HOME}/include/zlib.h"
then
ZLIB_HOME=/usr
fi
])
#
# Locate zlib, if wanted
#
if test -n "${ZLIB_HOME}"
then
ZLIB_OLD_LDFLAGS=$LDFLAGS
ZLIB_OLD_CPPFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
AC_LANG_SAVE
AC_LANG_C
AC_CHECK_LIB(z, inflateEnd, [zlib_cv_libz=yes], [zlib_cv_libz=no])
AC_CHECK_HEADER(zlib.h, [zlib_cv_zlib_h=yes], [zlib_cvs_zlib_h=no])
AC_LANG_RESTORE
if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes"
then
#
# If both library and header were found, use them
#
AC_CHECK_LIB(z, inflateEnd)
AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
AC_MSG_RESULT(ok)
else
#
# If either header or library was not found, revert and bomb
#
AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
LDFLAGS="$ZLIB_OLD_LDFLAGS"
CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
AC_MSG_RESULT(failed)
AC_MSG_ERROR(either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib)
fi
fi
])
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