make: "opt-debug-file.mk" line 43: This goes to stderr only, once. make: "opt-debug-file.mk" line 45: This goes to stderr only, once. make: "opt-debug-file.mk" line 47: This goes to stderr, and in addition to the debug log. CondParser_Eval: ${:!cat opt-debug-file.debuglog!:Maddition:[#]} != 1 Comparing 1.000000 != 1.000000 make: Missing delimiter for modifier ':S' make: Missing delimiter for modifier ':S' make: Missing delimiter for modifier ':S' CondParser_Eval: ${:!cat opt-debug-file.debuglog!:Mdelimiter:[#]} != 1 Comparing 1.000000 != 1.000000 Cannot open debug file "/nonexistent-6f21c672-a22d-4ef7/opt-debug-file.debuglog" exit status 2