App Compatibility doesn't work on iPhone 5c
iOS 11 is a 64-bit-only OS. Apps that were only built for previous 32-bit iOSes will not work on 11, which is where the incompatibility comes from.

Your iPhone 5c is a 32-bit phone, so it will not support iOS 11. As a result, there aren't app compatibility issues for it.

Apple's list of phones supported by iOS 11:


iPhone X
iPhone 8
iPhone 8 Plus
iPhone 7
iPhone 7 Plus
iPhone 6s
iPhone 6s Plus
iPhone 6
iPhone 6 Plus
iPhone SE
iPhone 5s