I fixed it!
The problem was that I had only edited my project-info.plist. I went and added the same lines for to the info.plist's for freetype.frameworks and sndfile.framework.
- CFBundleSupportedPlatforms => array,
- item0 => MacOSX
Seems to have done the trick.
ON A SIDE NOTE: i'm now getting this warning that SFML is using a deprecated audio unit
WARNING: 140: This application, or a library it uses, is using the deprecated Carbon Component Manager for hosting Audio Units. Support for this will be removed in a future release. Also, this makes the host incompatible with version 3 audio units. Please transition to the API's in AudioComponent.h.