The New C/C++ Project With Existing Sources wizard enables you to create a project using an existing makefile. When you select the Custom mode, you must make selections to determine how the project is configured.
In the Build Tool page, you specify whether you build your project using an existing makefile or using a makefile generated by a configure script.
The Clean and Build after Finish option causes the IDE to run the project's clean and build actions immediately after creating the project. Deselect this option if the source folder contains non-source files such as built binaries that you want to keep. You can clean and build manually after you move the files. You should also deselect to enable other options in the wizard.