fsevents_stubs uses functions unavailable on older macOS which breaks the build #6510
Description
The problem was partly addressed earlier: #5430 #5431
However, there are functions used in fsevents_stubs that are available only on 10.7+, and ocaml-dune still fails therefore on 10.5 and 10.6.
---> Building ocaml-dune
Executing: cd "/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_ocaml_ocaml-dune/ocaml-dune/work/dune-3.6.0" && /usr/bin/make -j6 -w release
make: Entering directory `/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_ocaml_ocaml-dune/ocaml-dune/work/ocaml-dune-bf9eb75'
ocamlc -output-complete-exe -w -24 -g -o .duneboot.exe -I boot unix.cma boot/libs.ml boot/duneboot.ml
./.duneboot.exe
cd _boot && /opt/local/bin/ocamlc -c -g -I +threads fsevents_stubs.c
src/fsevents/fsevents_stubs.c:67:5: error: 'kFSEventStreamEventFlagItemCreated' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUserDropped'?
src/fsevents/fsevents_stubs.c:67:42: error: 'kFSEventStreamEventFlagItemRemoved' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUserDropped'?
src/fsevents/fsevents_stubs.c:68:5: error: 'kFSEventStreamEventFlagItemRenamed' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagRootChanged'?
src/fsevents/fsevents_stubs.c:68:42: error: 'kFSEventStreamEventFlagItemModified' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUserDropped'?
src/fsevents/fsevents_stubs.c: In function 'dune_fsevents_create':
src/fsevents/fsevents_stubs.c:160:44: error: 'kFSEventStreamCreateFlagFileEvents' undeclared (first use in this function); did you mean 'kFSEventStreamCreateFlagNoDefer'?
src/fsevents/fsevents_stubs.c:160:44: note: each undeclared identifier is reported only once for each function it appears in
src/fsevents/fsevents_stubs.c: In function 'dune_fsevents_set_exclusion_paths':
src/fsevents/fsevents_stubs.c:185:14: warning: implicit declaration of function 'FSEventStreamSetExclusionPaths' [-Wimplicit-function-declaration]
src/fsevents/fsevents_stubs.c: In function 'dune_fsevents_kind':
src/fsevents/fsevents_stubs.c:256:15: error: 'kFSEventStreamEventFlagItemIsDir' undeclared (first use in this function); did you mean 'kFSEventStreamEventFlagUnmount'?
src/fsevents/fsevents_stubs.c: At top level:
src/fsevents/fsevents_stubs.c:298:5: error: 'kFSEventStreamEventFlagItemInodeMetaMod' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUserDropped'?
src/fsevents/fsevents_stubs.c:301:5: error: 'kFSEventStreamEventFlagItemFinderInfoMod' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagKernelDropped'?
src/fsevents/fsevents_stubs.c:302:5: error: 'kFSEventStreamEventFlagItemChangeOwner' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagRootChanged'?
src/fsevents/fsevents_stubs.c:303:5: error: 'kFSEventStreamEventFlagItemXattrMod' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUnmount'?
src/fsevents/fsevents_stubs.c:304:5: error: 'kFSEventStreamEventFlagItemIsFile' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUnmount'?
src/fsevents/fsevents_stubs.c:305:5: error: 'kFSEventStreamEventFlagItemIsDir' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUnmount'?
src/fsevents/fsevents_stubs.c:306:5: error: 'kFSEventStreamEventFlagItemIsSymlink' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUnmount'?
src/fsevents/fsevents_stubs.c:307:5: error: 'kFSEventStreamEventFlagOwnEvent' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagUnmount'?
src/fsevents/fsevents_stubs.c:308:5: error: 'kFSEventStreamEventFlagItemIsHardlink' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagHistoryDone'?
src/fsevents/fsevents_stubs.c:309:5: error: 'kFSEventStreamEventFlagItemIsLastHardlink' undeclared here (not in a function); did you mean 'kFSEventStreamEventFlagHistoryDone'?
make: *** [_boot/dune.exe] Error 2