FYI,
I have resolved this issue, by upgrading to PHP 4.1.0.
Initially when switiching to the new version of PHP I ran into an issue
with sapi_apache.c searching for httpd.h and a number of other Apache
include headers which were not in path since I was doing the --with-apxs
install instea
Apache 1.3.12, PHP 4.0.6, Solaris 2.6
./configure --with-apxs=/app/.o/Apache/Apache/bin/apxs
checking for Apache module support via DSO through APXS... yes
Initially I run into the stub.lo error, but I found a note in the archives
and moved the file to stub.lo.old. Problem solved. Make works