PHP 4.0.7 snapshot and rh7.1 (focus on IMAP,IMP)

OK, I've been trying to get rh7.1 to load a version of PHP accectable for Horde's IMP webmail software. OK, RH comes with 4.0.6 but the PEAR that is included does not qualify for HORDE (needs RFC822 and other messages). I tried d/l'ing php4.0.6 and compile, but get the "cannot find symbol: mxdriver" problem. In the archives, Jani mentions to d/l the newest snapshot. Things looked good from there. Horde's test.php said everything was in order. However, it seemed the htmlspecialchars() function as not returning any value under any circumstances. So, I tried other methods like downloading rpms, etc, but that yielded the same problem with the PEAR not being of the correct version. I was told that using 4.0.6 with 4.0.7 pear from cvs would work, but I still get the mxdriver problem. I even tried a new snapshot today, but php seems to be locking up. The test.php goes into an endless loop or something. Apache doesn't seem to dump, just hang. I simple phpinfo() works fine, but that doesn't help me get closer to my goal. Anyways, has anyone using rh7.1 gotten a version(s) of PHP to work/compile fine with IMP? RPM or source, it doesn't bother me at this point, I'll try anything. Anyways, thanks in advance. Dan Ellis