Error: Could not resolve SDK path for 'macosx10.8'

Question

So I just installed qt around 5 minutes ago, and when I wanted to code a simple line of text in the Push Button and try to run it, I got this error:

:-1: error: Coul

Answer 1

I recently upgraded from OSX 10.8 to 10.12 and ran into this using Qt 5.7

The issue was resolved by a combination of:

1) FranklinA's suggestion:

Open Xcode->Preferences->Locations->command line tools..select the CLT xcode-select active developer directory error

..and..

2) adding to the .pro file the following line: QMAKE_MAC_SDK = macosx10.12