AC_DEFUN([AC_PACKAGE_NEED_ATTR_XATTR_H],
  [ AC_CHECK_HEADERS([attr/xattr.h])
    if test "$ac_cv_header_attr_xattr_h" != "yes"; then
        echo
        echo 'FATAL ERROR: attr/xattr.h does not exist.'
        echo 'Install the extended attributes (attr) development package.'
        echo 'Alternatively, run "make install-dev" from the attr source.'
        exit 1
    fi
  ])

AC_DEFUN([AC_PACKAGE_NEED_ATTR_ERROR_H],
  [ AC_CHECK_HEADERS([attr/error_context.h])
    if test "$ac_cv_header_attr_error_context_h" != "yes"; then
        echo
        echo 'FATAL ERROR: attr/error_context.h does not exist.'
        echo 'Install the extended attributes (attr) development package.'
        echo 'Alternatively, run "make install-dev" from the attr source.'
        exit 1
    fi
  ])

AC_DEFUN([AC_PACKAGE_NEED_ATTRIBUTES_H],
  [ have_attributes_h=false
    AC_CHECK_HEADERS([attr/attributes.h sys/attributes.h], [have_attributes_h=true], )
    if test "$have_attributes_h" = "false"; then
        echo
        echo 'FATAL ERROR: attributes.h does not exist.'
        echo 'Install the extended attributes (attr) development package.'
        echo 'Alternatively, run "make install-dev" from the attr source.'
        exit 1
    fi
  ])

AC_DEFUN([AC_PACKAGE_WANT_ATTRLIST_LIBATTR],
  [ AC_CHECK_LIB(attr, attr_list, [have_attr_list=true], [have_attr_list=false])
    AC_SUBST(have_attr_list)
  ])

AC_DEFUN([AC_PACKAGE_NEED_GETXATTR_LIBATTR],
  [ AC_CHECK_LIB(attr, getxattr,, [
        echo
        echo 'FATAL ERROR: could not find a valid Extended Attributes library.'
        echo 'Install the extended attributes (attr) development package.'
        echo 'Alternatively, run "make install-lib" from the attr source.'
        exit 1
    ])
    libattr="-lattr"
    test -f ${libexecdir}${libdirsuffix}/libattr.la && \
	libattr="${libexecdir}${libdirsuffix}/libattr.la"
    AC_SUBST(libattr)
  ])

AC_DEFUN([AC_PACKAGE_NEED_ATTRGET_LIBATTR],
  [ AC_CHECK_LIB(attr, attr_get,, [
        echo
        echo 'FATAL ERROR: could not find a valid Extended Attributes library.'
        echo 'Install the extended attributes (attr) development package.'
        echo 'Alternatively, run "make install-lib" from the attr source.'
        exit 1
    ])
    libattr="-lattr"
    test -f ${libexecdir}${libdirsuffix}/libattr.la && \
	libattr="${libexecdir}${libdirsuffix}/libattr.la"
    AC_SUBST(libattr)
  ])

AC_DEFUN([AC_PACKAGE_NEED_ATTRIBUTES_MACROS],
  [ AC_MSG_CHECKING([macros in attr/attributes.h])
    AC_TRY_LINK([
#include <sys/types.h>
#include <attr/attributes.h>],
    [ int x = ATTR_SECURE; ], [ echo ok ], [
        echo
	echo 'FATAL ERROR: could not find a current attributes header.'
        echo 'Upgrade the extended attributes (attr) development package.'
        echo 'Alternatively, run "make install-dev" from the attr source.'
	exit 1 ])
  ])