The selftests automatically pick up the headers from the kernel
build directory so we don't have to install them to /usr ourselves.
KERNEL_RELEASE=$(make O="$BUILDDIR"/mkosi.kernel -s kernelrelease)
mkdir -p "$DESTDIR/usr/lib/modules/$KERNEL_RELEASE"
- make O="$BUILDDIR/mkosi.kernel" INSTALL_HDR_PATH=/usr headers_install
make O="$BUILDDIR/mkosi.kernel" INSTALL_MOD_PATH="$DESTDIR/usr" modules_install
make O="$BUILDDIR/mkosi.kernel" INSTALL_PATH="$DESTDIR/usr/lib/modules/$KERNEL_RELEASE" install
mkdir -p "$DESTDIR/usr/lib/kernel/selftests"