When building GhostPDL from source, the `make soinstall` command only installs Ghostscript. The PCL, XPS and GPDL shared objects and binaries are not installed.
Created attachment 19173 [details] Patch for Bug 702362
That actually was intentional, due to the GhostPCL, and therefore GhostPDL, products not being usable in a strictly (A)GPL environment - the vast majority of consumers of the shared libraries require GPL compliance. And so few people use XPS it didn't seem worth singling it out.
This change provides better consistency with the `install` target which installs the pcl and xps binaries if available. Users can use `--without-pcl` / `--without-xps` to disable the corresponding targets if not desired. If I understand correctly the GhostPDL libraries are GPL compliant, only the URW TrueType fonts are licensed under the AFPL.
"Fixed" in: https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=7a92c21b4a84