Broken make install

[kousu]

As a follow up to #7, after getting the driver compiling,

[root@requiem rtl8723bs]# make install
install -p -m 644 8723bs.ko  /lib/modules/4.11.9-1-ARCH/kernel/drivers/net/wireless/rtl8723bs/
install: target '/lib/modules/4.11.9-1-ARCH/kernel/drivers/net/wireless/rtl8723bs/' is not a directory: No such file or directory

[kousu]

A manual fix solves it

[root@requiem rtl8723bs]# sudo mkdir /lib/modules/4.11.9-1-ARCH/kernel/drivers/net/wireless/rtl8723bs/
[root@requiem rtl8723bs]# make install
install -p -m 644 8723bs.ko  /lib/modules/4.11.9-1-ARCH/kernel/drivers/net/wireless/rtl8723bs/
/sbin/depmod -a 4.11.9-1-ARCH
[root@requiem rtl8723bs]# 

but shouldn't this Just Work? What's the Makefile missing?

[kousu]

(and after the make install it even works and gets me online! sweet)