I don't have Catalina, but just to stimulate ideas, from a quick skim around the net...

https://github.com/flutter/flutter/issues/43713

> Solved my problem... Mac OS Catalina change default bash and conda environment was starting automatically...
> I had just comment on .bash_profile lines about initialization."

https://github.com/flutter/flutter/issues/42437

> I have solved my above issues by run "conda deactivate" to exist the Anaconda enviroment. I don't know why, but after I exited the Python anaconda enviroment, then I can run "flutter run" on IOS simulator without any problem.

https://stackoverflow.com/questions/54955154/get-error-attributes-may-not-be-specified-on-a-category-eagldrawable-h-xcode-1

> uninstall and re install xcode and it work like charm"

https://gitlab.phidani.be/Chirag.Patel/clang/commit/aa59bd4807e5129200864caedac0a6d22a8c8185

Looks like the error message was deleted a couple of years ago, so maybe a later compiler will help.

cheers -ben

On Tue, 14 Jan 2020 at 18:58, Fabio Niephaus <notifications@github.com> wrote:

Steps to reproduce:

cd build.macos64x64/squeak.cog.spur
make debug

Errors

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:109:12: error: attributes may not be specified on a category
@interface NSArray<ObjectType> (NSArrayDiffing)
           ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:196:12: error: attributes may not be specified on a category
@interface NSMutableArray<ObjectType> (NSMutableArrayDiffing)
           ^
In file included from <built-in>:1:
In file included from ./../../platforms/iOS/vm/SqueakPureObjc_Prefix.pch:12:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:48:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSKeyValueCoding.h:8:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSOrderedSet.h:112:12: error: attributes may not be specified on a category
@interface NSOrderedSet<ObjectType> (NSOrderedSetDiffing)
           ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSOrderedSet.h:187:12: error: attributes may not be specified on a category
@interface NSMutableOrderedSet<ObjectType> (NSMutableOrderedSetDiffing)

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