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SDCC Manual 2.4.9 VPATH feature SDCC supports the VPATH feature provided by configure and make. It allows to separate the source and build trees. Here's an example: cd ~                     # cd $HOME tar -xzf sdcc.src.tar.gz # extract source to directory sdcc mkdir sdcc.build         # put output in sdcc.build cd sdcc.build ../sdcc/configure        # configure is doing all the magic! make That's it! configure will create the directory tree will all the necessary Makefiles in ~/sdcc.build. It automagically computes the variables srcdir, top_srcdir and top_buildir for each directory. After running make the generated files will be in ~/sdcc.build, while the source files stay in ~/sdcc. This is not only usefull for building different binaries, e.g. when cross compiling. It also gives you a much better overview in the source tree when all the generated files are not scattered between the source files. And the best thing is: if you want to change a file you can leave the original file untouched in the source directory. Simply copy it to the build directory, edit it, enter `make clean', `rm Makefile.dep' and `make'. make will do the rest for you!