[zorp] Cannot find ZORP Lowlevel library version >= 3.0.6: is pkg-config in path?

Hi all I am trying to compile Zorp-GPL-3.0.5. As instructed I first installed libzorp-3.0.6 - that worked without a hitch. When trying to compile the main Zorp, I get the following message: Package zorplibll was not found in the pkg-config search path. Perhaps you should add the directory containing 'zorplibll.pc' to the PKG_CONFIG_PATH environment variable. No Package zorblibll found Configure:Cannot find ZORP Lowlevel library version >= 3.0.6: is pkg-config in path? Question: how in the heck do I do that, and what do I need to do to resolve this? Thanks in advance Mark.