Note to self : don’t forget this easy fix next time:
Searching for a valid kernel header path… The path “” is not a valid path to the 3.7.9-104.fc17.i686 kernel headers. Would you like to change it? [yes] ^C Execution aborted.
cp /usr/src/kernels/3.7.9-104.fc17.i686/include/generated/uapi/linux/version.h /lib/modules/3.7.9-104.fc17.i686/build/include/linux/