I am building on a machine where most dependencies are built with --prefix=/usr/pkg; a few are in the base system with --prefix=/usr. I have json-c installed in /usr/pkg.
With svn trunk, configure found -ljson-c (because I had passed LDFLAGS and CPPFLAGS to configure), and found many other things (geos, jpeg, etc.). But, it didn't find the json-c header file, apparently because it was looking in specific pathnames instead of trying to compile a program that includes the header. I don't understand why explicitly finding the header is necessary; I would just expect to have code that needs it do #include and then if it wasn't found to add the internal implementation to CPPFLAGS. (Actually, I don't understand why there is an internal implementation, but that may be about windows.) I worked around this with --with-libjson-c=/usr/pkg, but it would be nice if this weren't necessary. I'm not sure a "this seems too complicated" is fair for a ticket, and there's probably some intent here I'm unaware of, so maybe just a comment is in order.
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