update: what you probably already knew: httpd-2.2.14 included a srclib directory with pcre. That is missing in the alpha tarball.
mich...@x054:[/data/prj/alpha/httpd-2.3.4-alpha]find . | grep pcre ./server/util_pcre.c How you deal with it is your concern, but anyone with AIX will have to create an adjusted system to build the sources.