I compiled apache with threads. OK
I compiled php in this way:
./configure --prefix=/usr --with-apxs=/usr/sbin/apxs --with-mod_charset --enable-force-cgi-redirect --enable-discard-path --with-config-file-path=/etc/apache/ --enable-safe-mode --with-openssl --enable-bcmath --with-bz2 --enable-calendar --enable-ctype --with-gdbm --enable-ftp --with-gmp --with-mysql=/usr --with-xml=shared --with-readline=/usr --enable-trans-sid --enable-shmop --enable-sockets --with-regex=php --enable-sysvsem --enable-sysvshm --enable-yp --enable-memory-limit --with-tsrm-pthreads --enable-shared --disable-debug --with-zlib=/usr --with-oci8=/ora/app/oracle/product/8.0.5 --with-mm=/usr/lib --with-sybase=/usr/local/freetds 

but apache cannot start:
Syntax error on line 237 of /etc/apache/httpd.conf:
Cannot load /usr/libexec/libphp4.so into server: /usr/libexec/libphp4.so: undefined symbol: mm_create
/usr/sbin/apachectl start: httpd could not be started

I can start apache successfully if I don't use --with-sybase
I'm using freetds libraries 0.52 compiled with tds version 7.0 (for mssql).

I've tried compiling both 4.0.5rc1 and 4.0.6 sources, giving both /usr and /usr/lib for the --with-mm flag but it doesn't work.

here my libmm libraries:
root@server:/usr/lib# ls -l |grep mm
-rw-r--r--    1 root     root        15462 May 24  2001 libmm.a
-rw-r--r--    1 root     root          629 May 24  2001 libmm.la
lrwxrwxrwx    1 root     root           16 Nov 27 13:44 libmm.so -> libmm.so.11.0.23
lrwxrwxrwx    1 root     root           16 Nov 27 13:44 libmm.so.11 -> libmm.so.11.0.23
-rwxr-xr-x    1 root     root        19098 May 24  2001 libmm.so.11.0.23

thank you very much.
(I'm sorry for my english)

Ludovico