On Jul 23, 2020, at 11:53, Christopher Jones wrote:
>> Mojave 10.14 and later doesn't provide /usr/include anymore. System headers
>> like <algorithm> are only in the SDK now. Note the -isystem flag with the
>> path to the SDK isn't in that compile line. MacPorts put that flag into
>> CFLAGS, CXXFLAGS, CPPFLAGS, and a comparable one into LDFLAGS for you, so
>> this shows you that your build system isn't respecting those variables yet.
>> Read the makefile portgroup to see if any of the options it provides can
>> help you. Read your project's Makefile to see how it expects those values to
>> be supplied. The Makefile may not provide a way. If not, you'll have to
>> patch it to make it possible.
>
> clang (and gcc) both respect the SDKROOT env. var. This is an easy way to by
> the right SDK root.
>
> Add this to your login profile
>
> export SDKROOT=`xcrun --show-sdk-path`
>
> Note. you can also use xcrun directly with clang/gcc to do the same
>
> > xcrun clang …..
>
> but that requires the build commands to be patched, whereas setting SDKROOT,
> assuming the build system does not actively remove it, should work.
Oh, well I don't know anything about that, except that MacPorts does already
set the SDKROOT variable during all phases, so evidently that isn't working for
this build system either.
