FreeBSD's requires u_char to be defined:

checking net/if_tap.h usability... no
checking net/if_tap.h presence... yes
configure: WARNING: net/if_tap.h: present but cannot be compiled
configure: WARNING: net/if_tap.h: check for missing prerequisite header=
s?
configure: WARNING: net/if_tap.h: see the Autoconf documentation
configure: WARNING: net/if_tap.h: section "Present But Cannot Be Compil=
ed"
configure: WARNING: net/if_tap.h: proceeding with the preprocessor's result
configure: WARNING: net/if_tap.h: in the future, the compiler will take pre=
cedence
configure: WARNING: ## ------------------------------------------- ##
configure: WARNING: ## Report this to openssh-unix-dev@mindrot.org ##
configure: WARNING: ## ------------------------------------------- ##
checking for net/if_tap.h... yes

from config.log:

configure:6422: checking net/if_tap.h usability
configure:6434: gcc -c -g -O2 -Wall -Wpointer-arith -Wuninitialized -Wsign-=
compa
re conftest.c >&5
In file included from conftest.c:47:
/usr/include/net/if_tap.h:49: error: syntax error before "u_char"
configure:6440: $? =3D 1

DES
-- =

Dag-Erling Sm=F8rgrav - des@des.no
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