[MacPorts] #56733: czmq: does not find zmq's pkg-config files

[MacPorts]

#56733: czmq: does not find zmq's pkg-config files
--------------------+----------------------
 Reporter:  mojca   |      Owner:  stromnov
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  czmq zmq
--------------------+----------------------
 While trying to add zmq support to FontForge I noticed that there's
 something strange with (c)zmq configuration
 {{{
 > pkg-config --cflags libczmq
 Package zmq was not found in the pkg-config search path.
 Perhaps you should add the directory containing `zmq.pc'
 to the PKG_CONFIG_PATH environment variable
 Package 'zmq', required by 'libczmq', not found
 }}}

 The `zmq` itself provides `/opt/local/lib/pkgconfig/libzmq.pc` rather than
 `/opt/local/lib/pkgconfig/zmq.pc`

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Ticket URL: <https://trac.macports.org/ticket/56733>
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