gcc/g++ failures after xcode11 update

[Mihir Luthra]

Hi,

After the xcode update, there have been many question on stackoverflow
regarding gcc and g++ linking fails. Any ideas on what can be done?

https://stackoverflow.com/questions/58072318/cannot-link-any-c-program-with-gcc-on-mac-mojave

https://stackoverflow.com/questions/58073301/linker-error-when-trying-to-use-lzma-in-boostiostreams-from-macports

https://stackoverflow.com/questions/58071057/macports-g-fails-to-find-headers-after-recent-xcode-update

Mihir
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