[MacPorts] #60121: git-lfs @2.10.0 build cannot find <sys/clonefile.h> on macOS 10.11

[MacPorts]

#60121: git-lfs @2.10.0 build cannot find <sys/clonefile.h> on macOS 10.11
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  Reporter:  snowflake  |      Owner:  raimue
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.99
Resolution:  fixed      |   Keywords:  legacy-os
      Port:  git-lfs    |
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Comment (by RJVB):

 Replying to [comment:3 kencu]:
 > Adding the function to legacysupport doesn't seem possible as it is an
 apsf-specific feature, but it's conceivable a non-destructive similar
 replacement might be found, like using copyfile instead perhaps.

 Reviving an old ticket, but I've been thinking about this very question.

 Any decent code will not assume that the clonefile() function family can
 work because even on 10.12+ where the functions exist one can still use
 non-APFS filesystems. Systems that don't have the functions (10.11 and
 earlier) cannot use APFS.
 So, ''as far as I can tell'', all `legacy-support` would have to do is to
 provide shims (for 10.11 and earlier) that return an error and set error
 to ENOSUP (IIRC).

-- 
Ticket URL: <https://trac.macports.org/ticket/60121#comment:8>
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