I found the following file size for library files on my system:

816K /usr/local/opt/freetype/lib/libfreetype.a

1.9M /usr/local/opt/harfbuzz/lib/libharfbuzz.a

2.1M /usr/local/opt/sdl2/lib/libSDL2.a

I don't think people really mind a 20MB executable if it was a self contained application with good performance and UI.