@Christian-Ehrlicher Thanks for reply. After some hours of trying , I finally managed to make a progress, but then got stuck in the linkage stage. I decided to give up and downgraded to Qt 5.9.7. QOCI plugin compiled out of the box without any problems.

@mostefa Thanx mate

Thanx bro! I just guessed and download it :D

HI, if you use MSVC and not mingw you must replace the line C: \ Qt \ Qt5.4.0 \ Tools \ mingw482_32 \ bin \ mingw32-make.exe by nmake (cf Qt documentation) and I believe it's not recommended to use Qt 5.4.0 and MSVC,it's better tou use Qt 5.4.1 (binary compatiblity problems with 5.4.0 and MSVC)