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/usr/include/freebsd/linux/icmp.h is in freebsd-glue 0.2.22.

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#if defined(__unused) && !defined(__DO_NOT_DEFINE_UNUSED)
#define __DO_DEFINE_UNUSED_AT_THE_END_OF_ICMP_H
#endif

#undef __unused
#define __DO_NOT_DEFINE_UNUSED
#include_next <linux/icmp.h>
#undef __DO_NOT_DEFINE_UNUSED

#ifdef __DO_DEFINE_UNUSED_AT_THE_END_OF_ICMP_H
#define __unused __attribute__((__unused__))
#undef __DO_DEFINE_UNUSED_AT_THE_END_OF_ICMP_H
#endif