libc++-7-dev: arch-dependent-file-not-in-arch-specific-directory usr/lib/llvm-7/lib/libc++.a
libc++-7-dev: arch-dependent-file-not-in-arch-specific-directory usr/lib/llvm-7/lib/libc++fs.a
libc++-7-dev: arch-dependent-file-not-in-arch-specific-directory usr/lib/llvm-7/lib/libc++experimental.a
