/usr/src/zfs-0.7.5/config/user-libudev.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 14 15 16 17 18 19 | dnl #
dnl # Check for libudev - needed for vdev auto-online and auto-replace
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBUDEV], [
LIBUDEV=
AC_CHECK_HEADER([libudev.h], [
user_libudev=yes
AC_SUBST([LIBUDEV], ["-ludev"])
AC_DEFINE([HAVE_LIBUDEV], 1, [Define if you have libudev])
], [
user_libudev=no
])
AC_SEARCH_LIBS([udev_device_get_is_initialized], [udev], [
AC_DEFINE([HAVE_LIBUDEV_UDEV_DEVICE_GET_IS_INITIALIZED], 1, [
Define if udev_device_get_is_initialized is available])], [])
])
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