Ryan, > Yup, NSAppearanceNameDarkAqua is new in macOS 10.14. […]
> So you must be on macOS 10.13 with Xcode 10. Unfortunately not : > uname -a Darwin Air.local 18.2.0 Darwin Kernel Version 18.2.0: Sat Nov 3 12:30:49 PDT 2018; root:xnu-4903.231.1~11/RELEASE_X86_64 x86_64 As you can see, I even run a beta of 10.14.2. Air > ls -l /System/Library/Frameworks/AppKit.framework/Versions/Current/ total 43720 -rwxr-xr-x 1 root wheel 47503104 4 Nov 09:31 AppKit -rw-r--r-- 1 root wheel 309176 25 Jul 18:33 AppKit.tbd drwxr-xr-x 259 root wheel 8288 25 Jul 18:33 Headers drwxr-xr-x 3 root wheel 96 25 Jul 18:33 Modules drwxr-xr-x 77 root wheel 2464 7 Nov 22:57 Resources drwxr-xr-x 8 root wheel 256 21 Sep 05:59 XPCServices drwxr-xr-x 3 root wheel 96 7 Nov 22:57 _CodeSignature Air > ls -l /System/Library/Frameworks/AppKit.framework/Versions/Current/Headers/ total 1328 -rw-r--r-- 1 root wheel 301352 15 Mar 2018 AppKit.apinotes -rw-r--r-- 1 root wheel 8613 15 Mar 2018 AppKit.h -rw-r--r-- 1 root wheel 1920 15 Mar 2018 AppKitDefines.h […] All headers here are dated 15 Mars 2018, and are obviously 10.13 versions. I have Xcode 10.1 installed, and: Air > xcode-select --install xcode-select: error: command line tools are already installed, use "Software Update" to install updates Weird, no? Vincent