How to modify procfs

I am building OpenWRT and I need to modify /proc/sys/net/bridge/bridge-nf-filter-vlan-tagged during build time (I can't do it at run time because of read only filesystem), how can I do it?

procfs is a virtual filesystem, an interface to the running kernel (once you reboot, all changes are lost). At build time, the target kernel is not running, procfs not even mounted and /proc/ just an empty directory.

If you still want to do changes, you'll have to patch the kernel defaults in the source for getting this stick.

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