+# if we are cross-compiling we need kernel_dir specified
+if get_option('kernel_dir') == '' and meson.is_cross_build()
+ error('Need "kernel_dir" option for kmod compilation when cross-compiling')
+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
+ error('Cannot compile kernel modules as requested - are kernel headers installed?')
+endif
+
+# DO ACTUAL MODULE BUILDING