Franco,

  Thanks for your quick response. It seems that it is a common issue. I have used the following command
 to deactivate  libunwind-headers. "gcc10" is building now.

  My question is how to reactivate libunwind-headers?

  Thanks
  Tao

/Users/tzhang> sudo port -f deactivate libunwind-headers
Password:
Warning: port definitions are more than two weeks old, consider updating them by running 'port selfupdate'.
--->  Deactivating libunwind-headers @5.0.1_0
--->  Cleaning libunwind-headers



On 5/18/22 9:35 AM, Franco Vaccari wrote:
When I saw this error I just followed the instructions given in the error 
message and did

sudo port -f deactivate libunwind-headers

and retried the installation, and it worked. I think I reactivated 
libunwind-headers after installing gcc10

Ciao

Franco

On 18 May 2022, at 17:31, Tao Zhang <[email protected]> wrote:

sudo port -f deactivate libunwind-headers


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