Warning: Non Whitelisted Flag(s)

Hey everyone! Today I've been trying to use Swift with the C library GTK+ on linux and got everything to work property in package manager but I get this warning when running the application:
gtk+-3.0.pc: warning: non whitelisted flag(s): -pthread, -pthread, -pthread, -pthread, -pthread, -pthread, -pthread
Any idea how I can white-list these flags or get rid of this warning? Again this is using the Swift Package Manager on ubuntu.

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