Richard

Well more precisely this is a Fedora build which uses a chroot where very few packages are installed by default and the others must be explicitly called out as build...

Here's the output: ```bash # clang -v clang version 20.1.2 (Fedora 20.1.2-3.fc43) Target: x86_64-redhat-linux-gnu Thread model: posix InstalledDir: /usr/lib64/llvm20/bin Configuration file: /etc/clang/x86_64-redhat-linux-gnu-clang.cfg System configuration file directory: /etc/clang/ Found candidate GCC...

The above was from a local build so here's one from COPR: https://download.copr.fedorainfracloud.org/results/hobbes1069/OIIO/fedora-rawhide-x86_64/08898093-libobjc2/builder-live.log.gz

Just now getting back to this... libstc++ is installed: * Libraries: `libstdc++-15.0.1-0.12.fc43.x86_64` * Headers: `libstdc++-devel-15.0.1-0.12.fc43.x86_64` Clang verbose output: ```bash # clang++ -v clang version 20.1.8 (Fedora 20.1.8-3.fc43) Target: x86_64-redhat-linux-gnu Thread...

I filed a bug but have not heard anything yet. The package can't be completely broken without being noticed as quite a few Fedora packages use clang at this point,...

Looks like the problem may be with `-isystem /usr/include` working it's way into the flags. The problem has happened on Debian as well: https://lists.debian.org/debian-glibc/2020/04/msg00023.html

I tried adding `-DCMAKE_NO_SYSTEM_FROM_IMPORTED=ON` and building completes but ends with this error: ```bash [100%] Linking C shared library libobjc.so /usr/bin/cmake -E cmake_link_script CMakeFiles/objc.dir/link.txt --verbose=1 /usr/bin/ld: error: LLVM gold plugin has...

I manage it this way on Fedora, could be commited here but may need some updating first. https://src.fedoraproject.org/rpms/OpenColorIO/blob/master/f/OpenColorIO-setuptools.patch

I think 1.2 is the version of the specification. On Fedora we use the yaml-cpp project when is at version 0.6.2, but yes, 0.3.0 is quite old.

The packing is fairly complex compared to many packages I maintain in no small part due to the SELinux stuff. I also inherited the package so I can’t claim credit...