Adding suffix ".c"
Adding suffix ".d"
defining transformation from `.c' to `.d'
inserting ".c" (1) at end of list
inserting ".d" (2) at end of list
Adding suffix ".e"
defining transformation from `.d' to `.e'
inserting ".d" (2) at end of list
inserting ".e" (3) at end of list
Adding suffix ".f"
defining transformation from `.e' to `'
inserting ".e" (3) at end of list
inserting "" (0) at end of list
defining transformation from `.e' to `.f'
inserting ".e" (3) at end of list
inserting ".f" (4) at end of list
defining transformation from `.f' to `.e'
inserting ".f" (4) at end of list
inserting ".e" (3) at end of list
transformation .e complete
transformation .e.f complete
transformation .f.e complete
Wildcard expanding "all"...
SuffFindDeps "all"
	No known suffix on all. Using .NULL suffix
adding suffix rules
	trying all.e...not there
	trying all.d...not there
	trying all.f...not there
	trying all.c...not there
	trying all.e...not there
FindThem: skipping duplicate "all.e"
Wildcard expanding "issue6.f"...suffix is ".f"...
SuffFindDeps "issue6.f"
	trying issue6.e...not there
	trying issue6.d...not there
	trying issue6.f...got it
	applying .f -> .e to "issue6.e"
	applying .e -> .f to "issue6.f"
suffix is ".e"...
make: Graph cycles through issue6.f
`all' not remade because of errors.

Stop.
make: stopped in unit-tests
exit status 1