/usr/src/zfs-0.7.5/config/user-libaio.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 | dnl #
dnl # Check for libaio - only used for libaiot test cases.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBAIO], [
LIBAIO=
AC_CHECK_HEADER([libaio.h], [
user_libaio=yes
AC_SUBST([LIBAIO], ["-laio"])
AC_DEFINE([HAVE_LIBAIO], 1, [Define if you have libaio])
], [
user_libaio=no
])
])
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