help with php4 and horde

[John Baillie]

We have horde/IMP setup with php3, UWIMAP, LDAP and mysql and all works well.   There is some school management software we would like to test (schoolmation).   Schoolmation requires php4 The Debian default is to install horde with php3. If we do decide to use schoolmation it will sit on the same machine as horde. Does anyone have pointers they can share on configuring horde with php4 before I get started.   Thank you, John