cfxr @0.3.3: codesign fails on 10.15+: main executable or Info.plist must be a regular file (no symlinks, etc.)

[kencu (Ken)]

CodeSign /opt/local/var/macports/build/_opt_macportsofficial_macports-ports_audio_cfxr/cfxr/work/destroot/Applications/MacPorts/cfxr.app/Contents/Frameworks/SDL.framework (in target 'cfxr' from project 'cfxr')
    cd /opt/local/var/macports/build/_opt_macportsofficial_macports-ports_audio_cfxr/cfxr/work/nevyn-cfxr-7de29a3
    
    Signing Identity:     "-"
    
    /usr/bin/codesign --force --sign - -o runtime --preserve-metadata\=identifier,entitlements,flags --generate-entitlement-der /opt/local/var/macports/build/_opt_macportsofficial_macports-ports_audio_cfxr/cfxr/work/destroot/Applications/MacPorts/cfxr.app/Contents/Frameworks/SDL.framework
/opt/local/var/macports/build/_opt_macportsofficial_macports-ports_audio_cfxr/cfxr/work/destroot/Applications/MacPorts/cfxr.app/Contents/Frameworks/SDL.framework: the main executable or Info.plist must be a regular file (no symlinks, etc.)
Command CodeSign failed with a nonzero exit code

** INSTALL FAILED **

[kencu (Ken)]

this is one I haven't seen before.

builds OK on 10.11 to 10.14, which are presumably more relaxed about this.