In case of the sysctl.h include is missing from Cpu.cpp, I got 3 compilation errors on Cpu.cpp lines 168,169,173 like undeclared identifier 'CTL_HW', 'HW_MEMSIZE' and sysctl() fn prototype.
Perhaps, this is just a side effect of something else, which I didn't find yet... But there is a GetSystemMemoryStatus(r,r) fn implementation in this file, which have multiple "body" regarding to the PLATFORM_MACOS "switch", the referenced fn and sys ctrl codes are came from the sys/sysctl.h include file according to man 3 sysctl in this platform...
I compiled the umk here (because the normal make was getting failed earlier - known fixed reason). So, if I run the
make -f umkMakefile
command, this was the remaining issue, which can be fixed by adding the specific include to the file.
Yeah, probably it should be included from somewere else, I can imagine...

Back to the previous thread (compile mm files), I just wanted to build the umk and theide from its source on mac. There are .mm files in example: Draw/FontCoco.mm.
Some reason, my make still not able to link, because of the Makefile doesn't contains any *.mm files at all... I guess those are missing from my Makefile .
How could you compile the upp itself on Mac with the actual Makefile.in content?