[Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797

--- Comment #29 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
As suggested by Marc, I've removed the @ from include/Makefile.in, and removed
the leading - for lines with LN_S.

The result of "make -d --trace -j8 all-target-libstdc++-v3", in a build where
x86_64-apple-darwin17.0.0/libstdc++-v3 was entirely removed, can be found here:
https://gist.github.com/fxcoudert/b621465a794d968593bc7ed90c0fc1fb