The 'cd' output in the command echoed the directory into the
output, which is not welcome in the output file (gengetopt
did not like that).
$(ggo_dir)/client.ggo: $(ggo_dir)/loglevel.m4 $(ggo_dir)/config_file.m4
$(ggo_dir)/%.ggo: $(ggo_dir)/%.m4 $(ggo_dir)/header.m4
$(ggo_dir)/client.ggo: $(ggo_dir)/loglevel.m4 $(ggo_dir)/config_file.m4
$(ggo_dir)/%.ggo: $(ggo_dir)/%.m4 $(ggo_dir)/header.m4
- (cd $(ggo_dir) && m4 $(<F)) > $@
+ cd $(ggo_dir); m4 $(<F) > $(@F)