ghc @9.6.4: ./configure: line 12534: /usr/bin/clang++ -std=gnu++11: No such file or directory

[stevehav (Steve Havelka)]

Installing ghc gives the following error:

--->  Computing dependencies for ghc
--->  Fetching archive for ghc
--->  Attempting to fetch ghc-9.6.4_0.darwin_20.arm64.tbz2 from https://packages.macports.org/ghc
--->  Attempting to fetch ghc-9.6.4_0.darwin_20.arm64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/ghc
--->  Attempting to fetch ghc-9.6.4_0.darwin_20.arm64.tbz2 from http://mirror.fcix.net/macports/packages/ghc
--->  Configuring ghc
Error: Failed to configure ghc: consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_ghc/ghc/work/ghc-9.6.4/config.log
Error: Failed to configure ghc: configure failure: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_ghc/ghc/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
Error: Processing of port ghc failed

The log displays:

:info:configure checking C++ standard library flavour... ./configure: line 12534: /usr/bin/clang++ -std=gnu++11: No such file or directory
:info:configure configure: error: Failed to compile test program
:info:configure Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_ghc/ghc/work/ghc-9.6.4" && ./configure --prefix=/opt/local --with-gmp-includes=/opt/local/include --with-gmp-libraries=/opt/local/lib --with-iconv-includes=/opt/local/include --with-iconv-libraries=/opt/local/lib 
:info:configure Exit code: 1
:error:configure Failed to configure ghc: consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_ghc/ghc/work/ghc-9.6.4/config.log
:error:configure Failed to configure ghc: configure failure: command execution failed
:debug:configure Error code: NONE
:debug:configure Backtrace: configure failure: command execution failed
:debug:configure     while executing
:debug:configure "$procedure $targetname"
:error:configure See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_ghc/ghc/main.log for details.

[ryandesign (Ryan Carsten Schmidt)]

Duplicate of #69566.