/usr/src/zfs-0.6.5.6/config/user-libuuid.m4 is in zfs-dkms 0.6.5.6-0ubuntu8.
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 13 14 15 16 17 18 | dnl #
dnl # Check for libuuid
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBUUID], [
LIBUUID=
AC_CHECK_HEADER([uuid/uuid.h], [], [AC_MSG_FAILURE([
*** uuid/uuid.h missing, libuuid-devel package required])])
AC_CHECK_LIB([uuid], [uuid_generate], [], [AC_MSG_FAILURE([
*** uuid_generate() missing, libuuid-devel package required])])
AC_CHECK_LIB([uuid], [uuid_is_null], [], [AC_MSG_FAILURE([
*** uuid_is_null() missing, libuuid-devel package required])])
AC_SUBST([LIBUUID], ["-luuid"])
AC_DEFINE([HAVE_LIBUUID], 1, [Define if you have libuuid])
])
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