Merge pull request #653 from kasenvr/fix/osx-folder-icons

Update OSX folder icons to Vircadia & OSX build docs

BUILD_OSX.md

@@ -1,6 +1,6 @@
 # Build OSX
 
-*Last Updated on July 13, 2020*
+*Last Updated on August 26, 2020*
 
 Please read the [general build guide](BUILD.md) for information on dependencies required for all platforms. Only macOS specific instructions are found in this document.
 
@@ -17,7 +17,9 @@ Execute the `Update Shell Profile.command` script that is provided with the inst
 
 ### OSX SDK
 
-You will need the OSX SDK for building. The easiest way to get this is to install Xcode from the App Store.
+You will need version `10.12` of the OSX SDK for building, otherwise you may have crashing or other unintended issues due to the deprecation of OpenGL on OSX. You can get that SDK from [here](https://github.com/phracker/MacOSX-SDKs). You must copy it in to your Xcode SDK directory, e.g.
+
+    cp -rp ~/Downloads/MacOSX10.12.sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
 
 ### OpenSSL
 
@@ -28,18 +30,26 @@ For OpenSSL installed via homebrew, set OPENSSL_ROOT_DIR via
 
 ### Xcode
 
-If Xcode is your editor of choice, you can ask CMake to generate Xcode project files instead of Unix Makefiles. You will need to select the Xcode installation in the terminal first if you have not done so already.
+You can ask CMake to generate Xcode project files instead of Unix Makefiles using the `-G Xcode` parameter after CMake. You will need to select the Xcode installation in the terminal first if you have not done so already.
     
     sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
-
-    cmake .. -G Xcode
+    
+    cmake ../ -DCMAKE_OSX_SYSROOT="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk" -DCMAKE_OSX_DEPLOYMENT_TARGET=10.12 -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOSX_SDK=10.12  ..
 
 If `cmake` complains about Python 3 being missing, you may need to update your CMake binary with command `brew upgrade cmake`, or by downloading and running the latest CMake installer, depending on how you originally instaled CMake 
 
-After running cmake, you will have the make files or Xcode project file necessary to build all of the components. Open the hifi.xcodeproj file, choose ALL_BUILD from the Product > Scheme menu (or target drop down), and click Run.
+After running CMake, you will have the make files or Xcode project file necessary to build all of the components. Open the hifi.xcodeproj file, choose ALL_BUILD from the Product > Scheme menu (or target drop down), and click Run.
 
 If the build completes successfully, you will have built targets for all components located in the `build/${target_name}/Debug` directories.
 
 ### make
 
-If you build with make rather than Xcode, you can append `-j4`for assigning more threads. The number indicates the number of threads, e.g. 4.
+If you build with make rather than Xcode, you can append `-j4` for assigning more threads. The number indicates the number of threads, e.g. 4.
+
+To package the installation, you can simply run `make package` afterwards.
+
+### FAQ
+
+1. **Problem:** Running the scheme `interface.app` from Xcode causes a crash for Interface related to `libgl`
+    1. **Cause:** The target `gl` generates a binary called `libgl`. A macOS `libGL.framework` item gets loaded instead by Xcode. 
+    1. **Solution:** In the Xcode target settings for `libgl`, set the version to 1.0.0