Tip: Building on macOS Catalina with Command Line Tools 11.1

[metayan]

make app

was causing

python3 setup.py kitty.app 
CC: ['clang'] (12, 0)
[13/66] Compiling [cocoa] glfw/cocoa_init.m ... done
Compiling [cocoa] glfw/cocoa_window.m ...
clang -MMD -DNDEBUG -D_GLFW_COCOA -D_GLFW_BUILD_DLL -DGL_SILENCE_DEPRECATION -Wextra -Wfloat-conversion -Wno-missing-field-initializers -Wall -Wstrict-prototypes -std=c11 -pedantic-errors -Werror -O3 -fwrapv -fstack-protector-strong -pipe -march=native -fvisibility=hidden -D_FORTIFY_SOURCE=2 -flto -DKITTY_HAS_RS_SIG_ARGS -fPIC -c glfw/cocoa_window.m -o build/glfw-cocoa-cocoa_window.m.o
glfw/cocoa_window.m:34:9: fatal error: 'UniformTypeIdentifiers/UniformTypeIdentifiers.h' file not found
#import <UniformTypeIdentifiers/UniformTypeIdentifiers.h>
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [Makefile:36: app] Error 1

Solved it by pointing to the not found framework and building with

mkdir -p build/frameworks
ln -s /Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/System/Library/Frameworks/UniformTypeIdentifiers.framework build/frameworks/
CFLAGS="-Fbuild/frameworks" make app

Note:
Just pointing to the Command Line Tools framework directory with
CFLAGS="-F/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/System/Library/Frameworks" make app
didn't work. Got lots of errors instead.

[kovidgoyal]

Weird, the SDK's frameworks path should already be in the include paths clang looks in.