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(For context, I use XCode, and the project name is "Vigor2.")

I've begun using TGUI for my SFML projects, as it looks very interesting and powerful. I followed the homebrew installation instructions, adding -ltgui to Other Linker Flags in the build settings. However, when I try to use TGUI at all, I get some strange console messages.

objc[63774]: Class SFApplication is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2e78) and /usr/local/opt/sfml/lib/libsfml-window.2.5.dylib (0x100ba6198). One of the two will be used. Which one is undefined.
objc[63774]: Class SFApplicationDelegate is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2ef0) and /usr/local/opt/sfml/lib/libsfml-window.2.5.dylib (0x100ba6210). One of the two will be used. Which one is undefined.
objc[63774]: Class SFOpenGLView is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2f18) and /usr/local/opt/sfml/lib/libsfml-window.2.5.dylib (0x100ba6238). One of the two will be used. Which one is undefined.
objc[63774]: Class SFSilentResponder is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2f90) and /usr/local/opt/sfml/lib/libsfml-window.2.5.dylib (0x100ba62b0). One of the two will be used. Which one is undefined.
objc[63774]: Class SFWindow is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2fb8) and /usr/local/opt/sfml/lib/libsfml-window.2.5.dylib (0x100ba62d8). One of the two will be used. Which one is undefined.
objc[63774]: Class SFBlackView is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf3030) and /usr/local/opt/sfml/lib/libsfml-window.2.5.dylib (0x100ba6350). One of the two will be used. Which one is undefined.
objc[63774]: Class SFWindowController is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf3058) and /usr/local/opt/sfml/lib/libsfml-window.2.5.dylib (0x100ba6378). One of the two will be used. Which one is undefined.
objc[63774]: Class SFViewController is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf30a8) and /usr/local/opt/sfml/lib/libsfml-window.2.5.dylib (0x100ba63c8). One of the two will be used. Which one is undefined.
objc[63774]: Class SFApplication is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2e78) and /Users/(my username)/Library/Developer/Xcode/DerivedData/Vigor2-guhwhorcosfnsqcxuglttibdbzyk/Build/Products/Debug/Vigor2.app/Contents/Frameworks/sfml-window.framework/Versions/2.5.1/sfml-window (0x10037ee78). One of the two will be used. Which one is undefined.
objc[63774]: Class SFApplicationDelegate is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2ef0) and /Users/(my username)/Library/Developer/Xcode/DerivedData/Vigor2-guhwhorcosfnsqcxuglttibdbzyk/Build/Products/Debug/Vigor2.app/Contents/Frameworks/sfml-window.framework/Versions/2.5.1/sfml-window (0x10037eef0). One of the two will be used. Which one is undefined.
objc[63774]: Class SFOpenGLView is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2f18) and /Users/(my username)/Library/Developer/Xcode/DerivedData/Vigor2-guhwhorcosfnsqcxuglttibdbzyk/Build/Products/Debug/Vigor2.app/Contents/Frameworks/sfml-window.framework/Versions/2.5.1/sfml-window (0x10037ef18). One of the two will be used. Which one is undefined.
objc[63774]: Class SFSilentResponder is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2f90) and /Users/(my username)/Library/Developer/Xcode/DerivedData/Vigor2-guhwhorcosfnsqcxuglttibdbzyk/Build/Products/Debug/Vigor2.app/Contents/Frameworks/sfml-window.framework/Versions/2.5.1/sfml-window (0x10037ef90). One of the two will be used. Which one is undefined.
objc[63774]: Class SFWindow is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf2fb8) and /Users/(my username)/Library/Developer/Xcode/DerivedData/Vigor2-guhwhorcosfnsqcxuglttibdbzyk/Build/Products/Debug/Vigor2.app/Contents/Frameworks/sfml-window.framework/Versions/2.5.1/sfml-window (0x10037efb8). One of the two will be used. Which one is undefined.
objc[63774]: Class SFBlackView is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf3030) and /Users/(my username)/Library/Developer/Xcode/DerivedData/Vigor2-guhwhorcosfnsqcxuglttibdbzyk/Build/Products/Debug/Vigor2.app/Contents/Frameworks/sfml-window.framework/Versions/2.5.1/sfml-window (0x10037f030). One of the two will be used. Which one is undefined.
objc[63774]: Class SFWindowController is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf3058) and /Users/(my username)/Library/Developer/Xcode/DerivedData/Vigor2-guhwhorcosfnsqcxuglttibdbzyk/Build/Products/Debug/Vigor2.app/Contents/Frameworks/sfml-window.framework/Versions/2.5.1/sfml-window (0x10037f058). One of the two will be used. Which one is undefined.
objc[63774]: Class SFViewController is implemented in both /usr/local/lib/libsfml-window.2.5.dylib (0x100bf30a8) and /Users/(my username)/Library/Developer/Xcode/DerivedData/Vigor2-guhwhorcosfnsqcxuglttibdbzyk/Build/Products/Debug/Vigor2.app/Contents/Frameworks/sfml-window.framework/Versions/2.5.1/sfml-window (0x10037f0a8). One of the two will be used. Which one is undefined.
sfml-graphics requires support for OpenGL 1.1 or greater
Ensure that hardware acceleration is enabled if available

Additionally, TGUI widgets never show up on the window (though their connect methods do work) unless I draw an SFML drawable to the window before calling gui.draw(). I don't even have to give it a size or position, but unless I do that, the TGUI widgets are nowhere to be seen.

As I mentioned, I'm completely new to TGUI and I'm excited to start using it as soon as possible. Help figuring out one or both of my issues would be very appreciated.

Thanks!