make error

[peace_comp]

I dont understand ..i was compiling all the time ..everythg was alright .. since I had used some q Sql class ..then I had a msg error Sql4.dll not found.. after that most of my applications wont be compiled with the make command.. givin me the same msg !!???

[wysota]

When you already have a project file, you MUSN'T call "qmake -project" because it will overwrite the project file with a file generated using simple heuristics. Those heuristics work fine when there are no intermediate files (so without first compilation), but get confused when some trash resides in any of the subdirectories or the current directory.

[jacek]

then I had a msg error Sql4.dll not found..

Next time you encounter such error, edit your .pro file, add "QT += sql" and run qmake without any parameters.