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Changes between Initial Version and Version 1 of Ticket #61580, comment 5

initial	v1
1	1	Initially the patch didn't work for me: it adds a configure test for `sched_setscheduler` but it surprisingly determined that it was available, and then the build failed as before.
2	2
3		I noticed that the port forces the use of `-flat_namespace -undefined suppress` which has been in the port ever since it was added in 2005 in [8ed1835344effbeda34c7df31fce834174521fcf/macports-ports]. That was right after the release of Mac OS X ~~10.3~~. The use of the flat namespace was typical on Mac OS X 10.2 and earlier but in 10.3 and later the two-level namespace should be used instead. After removing the lines that forced the flat namespace, the configure test correctly determines that `sched_setscheduler` doesn't exist and the build succeeds.
	3	I noticed that the port forces the use of `-flat_namespace -undefined suppress` which has been in the port ever since it was added in 2005 in [8ed1835344effbeda34c7df31fce834174521fcf/macports-ports]. That was right after the release of Mac OS X ~~10.3~~ 10.4. The use of the flat namespace was typical on Mac OS X 10.2 and earlier but in 10.3 and later the two-level namespace should be used instead. After removing the lines that forced the flat namespace, the configure test correctly determines that `sched_setscheduler` doesn't exist and the build succeeds.