[alembic] build failure

[2403772980ygy]

Host Environment

• OS: Linux
• Compiler: revision

To Reproduce
Steps to reproduce the behavior:
./vcpkg install alembic

Failure logs
install-x64-linux-dbg-out.log

Additional context
Note that the build fails with debug settings because of -Werror

[PhoebeHui]

Duplicated to #12830.

[virtualritz]

I now get this:

./vcpkg install alembic
Computing installation plan...
The following packages will be built and installed:
    alembic[core]:x64-osx
Detecting compiler hash for triplet x64-osx...
Starting package 1/1: alembic:x64-osx
Building package alembic[core]:x64-osx...
Could not locate cached archive: /Users/moritz/.cache/vcpkg/archives/aa/aa3d68549dba7bde1f358614edd632efc2271dd7.zip
CMake Error at scripts/cmake/vcpkg_fail_port_install.cmake:93 (message):
  Target 'OSX' not supported by alembic!

Call Stack (most recent call first):
  ports/alembic/portfile.cmake:1 (vcpkg_fail_port_install)
  scripts/ports.cmake:79 (include)


Error: Building package alembic:x64-osx failed with: BUILD_FAILED
Please ensure you're using the latest portfiles with `./vcpkg update`, then
submit an issue at https://github.com/Microsoft/vcpkg/issues including:
  Package: alembic:x64-osx
  Vcpkg version: 2020.06.15-unknownhash

Additionally, attach any relevant sections from the log files above.

Alembic builds fine on macOS (It's not called OSX any more) for me if I do this manually.