Now I have a clean build. smile
Was not easy, because I deleted only the bin\mess\obj\ folder before.
But is was not enough, so i deleted also the Bin\mess\src\mess\formats\ folder and some files in bin\mess\src\mess\drivers\ folder.

Quote
H:\SVN\Bin\mess>mingw32-make TARGET=mess
mingw32-make: Nothing to be done for `all'.