# SPDX-License-Identifier: BSD-3-Clause
# Copyright(c) 2018 Intel Corporation
-subdirs = ['igb_uio']
+subdirs = ['igb_uio', 'kni']
+# if we are cross-compiling we need kernel_dir specified
+if get_option('kernel_dir') == '' and meson.is_cross_build()
+ warning('Need "kernel_dir" option for kmod compilation when cross-compiling')
+ subdir_done()
+endif
+
+kernel_dir = get_option('kernel_dir')
+if kernel_dir == ''
+ # use default path for native builds
+ kernel_version = run_command('uname', '-r').stdout().strip()
+ kernel_dir = '/lib/modules/' + kernel_version
+endif
+
+# test running make in kernel directory, using "make kernelversion"
+make_returncode = run_command('make', '-sC', kernel_dir + '/build',
+ 'kernelversion').returncode()
+if make_returncode != 0
+ warning('Cannot compile kernel modules as requested - are kernel headers installed?')
+ subdir_done()
+endif
+
+# DO ACTUAL MODULE BUILDING
foreach d:subdirs
subdir(d)
endforeach