I'd probably go get the same-version SLES media and then install Apache
httpd and PHP from there, since it all just works. Compiling can work
too, but you're not going to be able to find as much help there as you
could here if you only did stuff as weird as installing SLES stuff on
SLED. You could also potentially just build your desktop (assuming your
SLED box is a desktop) using SLES media; the two are pretty similar at the
base, though then some of the nice desktop pieces may then be missing.

Good luck.

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