[MacPorts] #64416: isl @0.24_1+universal: Failed to configure isl

[MacPorts]

#64416: isl @0.24_1+universal: Failed to configure isl
-----------------------+---------------------------------
 Reporter:  xiaoyixie  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.7.1
 Keywords:             |       Port:  isl, py39-numpy etc
-----------------------+---------------------------------
 isl failed to configure for macOS Big Sur. This leads to the failed
 installation of py39-NumPy etc. The error messages say:
 {{{

 --->  Configuring isl
 Error: Failed to configure isl: consult
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_isl/isl/work/isl-0.24-arm64/config.log
 Error: Failed to configure isl: configure failure: command execution
 failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_isl/isl/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there is a bug.
 Error: Processing of port isl failed
 }}}

 The error message in config.log file shows that:
 {{{
 configure:4549: /usr/bin/clang++ -V >&5
 clang: error: argument to '-V' is missing (expected 1 value)
 clang: error: no input files
 configure:4560: $? = 1
 configure:4549: /usr/bin/clang++ -qversion >&5
 clang: error: unknown argument '-qversion'; did you mean '--version'?
 clang: error: no input files
 }}}

 Also:
 {{{
 configure:4863: /usr/bin/clang -E -I/opt/local/include
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk conftest.c
 conftest.c:11:10: fatal error: 'ac_nonexistent.h' file not found
 #include <ac_nonexistent.h>
          ^~~~~~~~~~~~~~~~~~
 1 error generated.
 configure:4863: $? = 1

 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/64416>
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