Can't compile after running xcode legacy (XCode 10 or 11)

[DrWig]

I get the issue below. Even when running a simple command line test after using xcodelegacy install (which seems to install fine).

Showing Recent Messages
: unknown error while handling message: unableToInitializeCore(errors: ["/Applications/Xcode.app/Contents/PlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library/Xcode/Plug-ins/GCC 4.0.xcplugin/Contents/Resources/GCC Generic.xcspec: warning: spec ':com.apple.compilers.gcc' already registered from /Applications/Xcode.app/Contents/PlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library/Xcode/Plug-ins/Clang LLVM 1.0.xcplugin/Contents/Resources/Default Compiler.xcspec", "/Applications/Xcode.app/Contents/PlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library/Xcode/Plug-ins/GCC 4.0.xcplugin/Contents/Resources/GCC 4.0.xcspec: error: unknown spec 'Class': 'PBXCompilerSpecificationGcc3_3'", "/Applications/Xcode.app/Contents/PlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library/Xcode/Plug-ins/GCC 4.2.xcplugin/Contents/Resources/GCC 4.2.xcspec: error: unknown spec 'Class': 'PBXCompilerSpecificationGcc3_3'"])

Any ideas?

[DrWig]

Sorry, this seems to be the same as issue #49
The fix suggested for that issue works for me, too.