@dc42 Hello!
Thank you for the quick reply. Unfornately, i was still not be able to build the project with the suggested way. I tried everything to set the make path to my directory where make.exe lies but it threw errors after errors eventhough the path parameter was correct.
BUT i found the solution by uninstalling and installing the ARM Eclipse Tools. This time i didn't have any space or blanks in my install directory. eg: "C:\ARMEclipseTools\2.6-201507152002\bin"
And this way it worked like a charm! Although i had lots of errors regarding wifisocket module, it built duet3 bin file. I loaded it on my duet3 board to see if it's working and there seems to be no problem so far.
Thanks for the help!