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Never name one of your subdirectories obj/ if you don’t like surprises.
If an obj/ directory exists, BSD make enters it
before reading the makefile. Hence the makefile in the
current directory is not read.
$ cat Makefile
all:
echo Hello
$ cat obj/Makefile
all:
echo World
$ make # GNU make
echo Hello
Hello
$ pmake # BSD make
echo World
World