[MacPorts] #59648: rxvt-unicode install fails

[MacPorts]

#59648: rxvt-unicode install fails
--------------------+--------------------------
 Reporter:  jghub   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.2
 Keywords:          |       Port:  rxvt-unicode
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 install fails due to inability to locate <sys/types.h>. although the file
 is in place at
 "/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/sys/types.h".
 this happens even after having downgraded the command line tools from
 Xcode 11 to Xcode 10.

 main.log attached.

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Ticket URL: <https://trac.macports.org/ticket/59648>
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