make ARCH=armv7l CROSS_COMPILE= -C /lib/modules/3.8.13-bone26/build M=/root/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405 modules
make[1]: Entering directory `/lib/modules/3.8.13-bone26/build'
make[1]: *** No rule to make target `modules'. Stop.
make[1]: Leaving directory `/lib/modules/3.8.13-bone26/build'
make: *** [modules] Error 2