/usr/src/zfs-0.7.5/config/user-libattr.m4 is in zfs-dkms 0.7.5-1ubuntu15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | dnl #
dnl # Check for libattr
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBATTR], [
LIBATTR=
AC_CHECK_HEADER([attr/xattr.h], [], [AC_MSG_FAILURE([
*** attr/xattr.h missing, libattr-devel package required])])
AC_SUBST([LIBATTR], ["-lattr"])
AC_DEFINE([HAVE_LIBATTR], 1, [Define if you have libattr])
])
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