Unable to build world since early June

Hi all,

I have tried - and failed - repeatedly since end of May/early June to 
build world on my amd64 system. Since the instability issues 
(amd64-specific and others) surfaced early June I haven't been overly 
concerned about this, since I luckily found a 'sweet spot' of relative 
stability back then and haven't needed to upgrade.

Now that 5.3 is getting near, though, I am trying to build world again, 
to prepare for an upgrade. After removing /usr/obj and all subdirs of 
/usr/src plus running a cvsup against RELENG_5 (which I assume is what I 
need to get the latest 5-branch code), I am still unable to compile 
world (fails in lib/libc - following is the output of a 'make' in that 
directory):

cc -O -pipe  -I/usr/src/lib/libc/include 
-I/usr/src/lib/libc/../../include -I/usr/src/lib/libc/amd64 
-D__DBINTERFACE_PRIVATE -I/usr/src/lib/libc/../../contrib/gdtoa -DINET6 
-I/usr/obj/usr/src/lib/libc -DPOSIX_MISTAKE -I/usr/src/lib/libc/locale 
-DBROKEN_DES -DPORTMAP -DDES_BUILTIN -I/usr/src/lib/libc/rpc -DYP 
-DHESIOD -Wsystem-headers -Werror -Wall -Wno-format-y2k 
-Wno-uninitialized -c /usr/src/lib/libc/net/getaddrinfo.c
In file included from /usr/src/include/string.h:49,
                  from /usr/src/lib/libc/net/getaddrinfo.c:89:
/usr/src/include/strings.h:41: error: syntax error before "__pure"
/usr/src/include/strings.h:50: error: syntax error before "__pure"
/usr/src/include/strings.h:51: error: syntax error before "__pure"
/usr/src/include/strings.h:52: error: syntax error before "__pure"
/usr/src/include/strings.h:53: error: syntax error before "__pure"
In file included from /usr/src/lib/libc/net/getaddrinfo.c:89:
/usr/src/include/string.h:61: error: syntax error before "__pure"
/usr/src/include/string.h:62: error: syntax error before "__pure"
/usr/src/include/string.h:68: error: syntax error before "__pure"
/usr/src/include/string.h:71: error: syntax error before "__pure"
/usr/src/include/string.h:72: error: syntax error before "__pure"
/usr/src/include/string.h:75: error: syntax error before "__pure"
/usr/src/include/string.h:87: error: syntax error before "__pure"
/usr/src/include/string.h:92: error: syntax error before "__pure"
/usr/src/include/string.h:95: error: syntax error before "__pure"
/usr/src/include/string.h:97: error: syntax error before "__pure"
/usr/src/include/string.h:98: error: syntax error before "__pure"
/usr/src/include/string.h:103: error: syntax error before "__pure"
/usr/src/include/string.h:104: error: syntax error before "__pure"
/usr/src/lib/libc/net/getaddrinfo.c: In function `explore_numeric_scope':
/usr/src/lib/libc/net/getaddrinfo.c:1271: warning: implicit declaration 
of function `strchr'
/usr/src/lib/libc/net/getaddrinfo.c: In function `get_canonname':
/usr/src/lib/libc/net/getaddrinfo.c:1315: warning: implicit declaration 
of function `strlen'
/usr/src/lib/libc/net/getaddrinfo.c: In function `getanswer':
/usr/src/lib/libc/net/getaddrinfo.c:1790: warning: implicit declaration 
of function `strcasecmp'
/usr/src/lib/libc/net/getaddrinfo.c: In function `_gethtent':
/usr/src/lib/libc/net/getaddrinfo.c:2073: warning: implicit declaration 
of function `strpbrk'
*** Error code 1

Stop in /usr/src/lib/libc.


Anyone? Did I miss some important information? Did I forget to RTFM or 
something?

Thanks,
/Eirik