[MacPorts] #67510: symengine @0.9.0: Undefined symbols: "_futimens"

[MacPorts]

#67510: symengine @0.9.0: Undefined symbols: "_futimens"
---------------------------------------+---------------------------------
 Reporter:  ryandesign                 |      Owner:  MarcusCalhoun-Lopez
     Type:  defect                     |     Status:  assigned
 Priority:  Normal                     |  Milestone:
Component:  ports                      |    Version:  2.8.1
 Keywords:  yosemite elcapitan sierra  |       Port:  symengine
---------------------------------------+---------------------------------
 symengine fails to build on Yosemite, El Capitan, and Sierra:

 https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/232424/steps
 /install-port/logs/stdio
 {{{
 Undefined symbols for architecture x86_64:
   "_futimens", referenced from:
       llvm::sys::fs::setLastAccessAndModificationTime(int,
 std::__1::chrono::time_point<std::__1::chrono::system_clock,
 std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >
 >, std::__1::chrono::time_point<std::__1::chrono::system_clock,
 std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> >
 >) in libLLVMSupport.a(Path.cpp.o)
 }}}

 legacysupport, which symengine already includes, provides `futimens`, but
 the port specifies that legacysupport is only needed on Darwin 13 and
 earlier:

 https://github.com/macports/macports-
 ports/blob/f79cf03e01e88ec9673426f63369d3d98c5c5ac6/math/symengine/Portfile#L87

 Evidently it's needed on Darwin 16 and earlier.

-- 
Ticket URL: <https://trac.macports.org/ticket/67510>
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