=== Building reachability probe (self-contained, no netmap headers) ===
REACHABILITY_PROBE_BUILD_RC=0

=== Attempting to build intended PoC (poc.c) -- vendored net/ headers ===
=== Expected to fail: netmap.h needs IFNAMSIZ from <net/if.h> which ===
=== is not in the standard userspace path on this guest.            ===
In file included from poc.c:20:
./net/netmap.h:250:16: error: 'IFNAMSIZ' undeclared here (not in a function); did you mean 'RFNAMEG'?
  char  ni_name[IFNAMSIZ]; /* name of the interface. */
                ^~~~~~~~
                RFNAMEG
In file included from poc.c:21:
./net/netmap_user.h:68:10: fatal error: net/netmap/netmap.h: No such file or directory
 #include <net/netmap/netmap.h>
POC_BUILD_RC=0

=== The netmap.ko kernel module also fails to build ===
=== (see netmap_build_attempt.log: if_unused7 no longer in ifnet) ===