I am working on an API (hopefully will post something about it soon) that, 
beyond other stuff, checks wlan driver capabilities (just like ifconfig(1) 
does). However, the capabilities macro, which is IEEE80211_C_BITS, is defined 
in sys/net80211/ieee80211_var.h and I am not sure whether #include'ing 
ieee80211_var.h just for this macro is a good idea or not.

I have noticed that IEEE80211_C_BITS is re-defined in 
sbin/ifconfig/ifieee80211.c to be used by list_capabilities() function; does 
this not require update of IEEE80211_C_BITS macro in multiple source files?

What would be the best approach to use IEEE80211_C_BITS in my source file; 
including ieee80211_var.h or re-defining the macro in the source file (similar 
to ifconfig(1))?

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