问题
I am looking to do Qt development with Visual Studio 2005.
I have built the Qt libraries for Visual C++ and have downloaded the Qt plug-in using the steps outlined here.
I've set the QTDIR environment variable to point to the newly built Qt environment (C:\Qt\vc).
However, when I start Visual Studio, I get the following message:
These Qt versions are inaccessible: vc in c:\Qt\vc. Make sure that you have read access to all files in your Qt directories.
(And I definitely have read access)
How can I fix this?
回答1:
I fixed it. The key is to point QTDIR to the qt directory within the environment, so in my case c:\Qt\vc\qt. The error message is just not very intuitive.
回答2:
The similar error can arise in Visual Studio Add-In for Qt 5 when it fails to find proper directory itself (wrong QTDIR?)
The solution is to go to QT5 — Qt Options menu in Visual Studio and point it to the proper c:\...\Qt5xx\qtbase directory.
Note that you can completely delete QTDIR and Qt from PATH environment variable and switch Qt versions from within the Qt Options menu.
回答3:
After applying all your possible solutions I still had the same problem when building with Incredibuild.
I investigated the source code of the VS Addin and finally found a way to solve it:
In your Qt folder, you have to create a new dir default under the mkspecs folder, which contains a qmake.conf having the following content:
QMAKESPEC_ORIGINAL=../win32-msvc2012
include(../win32-msvc2012/qmake.conf)
(Replace win32-msvc2012 with the appropriate platform and buildtools)
回答4:
Addition to the best answer:
It could also possible that your Qt installation is incomplete. This could happen if you install Qt by module-based third-party installers (like OSGeo4W). Qt Visual Studio Add-in detects qmake.exe to locate Qt installation. Therefore, if qmake.exe is absent, it will raise this error.
To resolve the problem, install the module which is named qt5-devel or so.
来源：https://stackoverflow.com/questions/1443905/trouble-using-qt-with-visual-studio