`_POSIX_VDISABLE' undeclared

[NAKAJI Hiroyuki]

Dear developpers,

I'm using OpenSSH_2.9p1 with prngd on my Sony NEWS-OS 4.2.1R.
NEWS-OS 4.x is based on 4.3BSD and lack of many POSIX and ANSI features.

Today I tried to make the latest openssh_cvs and got the following error,

gcc -g -O2 -Wall -O -I. -I.. -I. -I./.. -I/usr/local/ssl/include  -DHAVE_CONFIG_H -c readpassphrase.c
readpassphrase.c: In function `readpassphrase':
readpassphrase.c:89: `_POSIX_VDISABLE' undeclared (first use this function)
readpassphrase.c:89: (Each undeclared identifier is reported only once
readpassphrase.c:89: for each function it appears in.)
readpassphrase.c:54: warning: `status' might be used uninitialized in this function
gmake[1]: *** [readpassphrase.o] Error 1

Any help is appreciated. Thanks.

P.S.
I configured with '--with-cflags="-O"' but CFLAGS is set "-g -O2 -Wall
-O". This should be fixed, too.
-- 
NAKAJI Hiroyuki