can't build latest master

[steve]

[ 628/3837] Compiling lib/util/genrand.c
In file included from ../source4/../lib/crypto/crypto.h:22:0,
                 from ../lib/util/genrand.c:24:
../source4/../lib/crypto/md5.h:31:3: error: expected ‘;’, identifier or
‘(’ before ‘struct’
Waf: Leaving directory `/home/steve/samba-master/bin'
Build failed:  -> task failed (err #1): 
        {task: cc genrand.c -> genrand_1.o}
make: *** [all] Error 1