Invalid option '-Wextra' and invalid option: '-fno-keep-inline-dllexport', how to set those options?
			
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I'm trying to compile the project of this" tutorial":http://doc.qt.io/qtcreator/creator-writing-program.html with QT 5.O.1
and these are the following errors I'm receiving:
invalid option: '-Wextra'
invalid option: '-fno-keep-inline-dllexport'
I don't know what to do, if someone can help please. - 
Hi and welcome to devnet,
Are you starting that project from scratch ?
What OS/compiler are you using ? And why are you using such an old version of Qt ? Since you seem to begin you should use the latest version which is 5.4 at this time.