diff -Nur cdogs-sdl-0.9.0/src/proto/nanopb/generator/nanopb_generator.py new/src/proto/nanopb/generator/nanopb_generator.py
--- cdogs-sdl-0.9.0/src/proto/nanopb/generator/nanopb_generator.py	2020-09-16 15:27:30.000000000 +0200
+++ new/src/proto/nanopb/generator/nanopb_generator.py	2020-09-30 12:35:40.026179442 +0200
@@ -1928,7 +1928,7 @@
     for fdesc in fdescs.values():
         results = process_file(fdesc.name, fdesc, options, other_files)
 
-        base_dir = options.output_dir or ''
+        base_dir = options.output_dir or '.'
         to_write = [
             (os.path.join(base_dir, results['headername']), results['headerdata']),
             (os.path.join(base_dir, results['sourcename']), results['sourcedata']),