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I am seeing a very strange situation where doing: make -C dir all does not rebuild anything in dir, even though stuff is stale. This command is what the recursive makefile uses to walk the directory structure. The really strange thing is that: cd dir; make all does rebuild stuff. Does anyone have any idea what is going on here? I thought they were identical. -Chris

> make -d -C dir all >run1 > cd dir; make -d all >../run2 cd .. diff -udb run1 run2 | less But maybe you don't have GNU make, but some Apple (BSD-derived) make which doesn't have the "-d" switch ...