Fail upgrading devel/m4

I have an extrange problem. Trying to upgrade all ports with portmaster on 8.2-RELEASE, got an error when compiling devel/m4.

Code:
In file included from execute.c:47:
./spawn.h:469: error: 'POSIX_SPAWN_RESETIDS' undeclared here (not in a function)
./spawn.h:469: error: 'POSIX_SPAWN_SETPGROUP' undeclared here (not in a function)
./spawn.h:470: error: 'POSIX_SPAWN_SETSIGDEF' undeclared here (not in a function)
./spawn.h:470: error: 'POSIX_SPAWN_SETSIGMASK' undeclared here (not in a function)
*** Error code 1

Stop in /nas/freebsd/ports/devel/m4/work/m4-1.4.16/lib.
*** Error code 1

I've searched for this, but don't get anithing usefull. I'm really lost.

Any idea ???

Thanks !
 
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