1. ----------------------------------
>> ./configure --with-mysql=/opt/mysql --with-apache=../apache_1.3.9  --enable-track-vars


fire1:/opt/i/php-4.0b3# make
        make  all-recursive
Making all in libzend
Target "all" is up to date.
Making all in ext
Making all in apache
        /bin/sh ../../libtool --silent --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../../li
bzend -I../.. -I../../libzend -I/opt/i/apache_1.3.9/src/include -I/opt/i/apache_1.3.9/src/os/unix
-I/opt/mysql/include      -O2 -g -O2 -c -o apache.lo apache.c
In file included from /opt/i/apache_1.3.9/src/include/ap_config.h:115,
                 from ../../php.h:179,
                 from apache.c:22:
/opt/i/apache_1.3.9/src/os/unix/os.h:119: conflicting types for `dlerror'
/usr/include/dlfcn.h:35: previous declaration of `dlerror'
make: 1254-004 The error code from the last command is 1.

2.----------------------------------------------
although './configure ... ' form install-root runs in ./libzend too, './configure' has to executed again in the libzend directory to generate 'zend_config.h' from 'zend_config.h.in' 
 
with compliments woba