Qt 5 library missing

I was trying to compile using MinGW's windeployqt. As parameter I put my .exe file and when I try to start my application it tells me that the libgcc_s_seh-1 library is missing. So I try to add it manually and it gives me the same error of the previous post:

The application was unable to start correctly (0xc000007b).

How can I fix it? Thanks.

windeployqt can be a tricky customer: It picks its information where to find the Qt libraries from the %PATH% variable in Windows. If you have two or more Qt / mingw instances installed, this might end up in a unhealthy mixture. Replace the wrong path to mingw in the environment by the correct value.