Parse input for the first makefile targets that fail. * * It is important that it is the first failing to avoid possible problems with * recursive makefiles which would end with multiple makefile targets that * fail. I assume that the first one is the most specific and relevant. * * TODO: if that isn't good enough maybe another approach would be to * concatenate them to one big target? It would reflect in a "chain" of targets * that lead up to the error. * * Params: * r = range that is chunked by line * report = where the results are put.