[root@stargate php-3.0b4]# make
gcc -O2 -I.   -I/root/apache_1.2.5/src      -I/usr/local/Hughes/include    -g -Wall     -c language-parser.tab.c -o language-parser.tab.o
In file included from parser.h:120,
                 from language-parser.y:49:
/usr/include/string.h:96: conflicting types for `strndup'
alloc.h:52: previous declaration of `strndup'
make: *** [language-parser.tab.o] Error 1
[root@stargate php-3.0b4]#

the declaration in /usr/include/string.h is as follows:

extern char *strndup __P ((__const char *__string, size_t __n));

i configured PHP with 

./configure --with-system-regex --with-apache=/root/apache_1.2.5 --with-msql=/usr/local/Hughes