$(LOGFILE):
@for target in $(TESTS); do \
cat <$$target/report.txt >>$(LOGFILE) || echo $$target ": no report" >>$(LOGFILE); \
done
$(LOGFILE):
@for target in $(TESTS); do \
cat <$$target/report.txt >>$(LOGFILE) || echo $$target ": no report" >>$(LOGFILE); \
done