[MacPorts] #56299: rb-cocoa: fatal error: 'string.h' file not found

[MacPorts]

#56299: rb-cocoa: fatal error: 'string.h' file not found
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  kimuraw
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  rb-cocoa
------------------------+----------------------
 rb-cocoa does not build on macOS High Sierra:

 {{{
 clang: warning: no such sysroot directory:
 '/Developer/SDKs/MacOSX10.4u.sdk' [-Wmissing-sysroot]
 clang: warning: no such sysroot directory:
 '/Developer/SDKs/MacOSX10.4u.sdk' [-Wmissing-sysroot]
 In file included from src/types.c:27:
 ./include/ffi_common.h:37:11: fatal error: 'string.h' file not found
 # include <string.h>
           ^~~~~~~~~~
 1 error generated.
 }}}

 The 10.4u SDK is not available on recent systems.

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Ticket URL: <https://trac.macports.org/ticket/56299>
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