/usr/src/zfs-0.7.5/config/user-libblkid.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 13 | dnl #
dnl # Check for libblkid. Basic support for detecting ZFS pools
dnl # has existing in blkid since 2008.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBBLKID], [
LIBBLKID=
AC_CHECK_HEADER([blkid/blkid.h], [], [AC_MSG_FAILURE([
*** blkid.h missing, libblkid-devel package required])])
AC_SUBST([LIBBLKID], ["-lblkid"])
AC_DEFINE([HAVE_LIBBLKID], 1, [Define if you have libblkid])
])
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