#43939: libpng: pngconf.h:366:52: error: token is not a valid binary operator in a preprocessor subexpression -------------------------+-------------------------- Reporter: macports@… | Owner: ryandesign@… Type: defect | Status: assigned Priority: Normal | Milestone: Component: ports | Version: 2.3.0 Resolution: | Keywords: Port: libpng | -------------------------+-------------------------- Comment (by ryandesign@…): He said "MacPro", all of which are 64-bit. I'm guessing he has an older version of Xcode, with an older version of clang, before they added support for `__has_attribute`. I can try installing an older Xcode on my Snow Leopard machine. -- Ticket URL: <https://trac.macports.org/ticket/43939#comment:11> MacPorts <http://www.macports.org/> Ports system for OS X