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FreeBSD make works differently with `-j` option. > -j max_jobs > Specify the maximum number of jobs that `make` may have running > at any one time. The value is saved in `.MAKE.JOBS.` Turns > compatibility mode off, unless the `B` flag is also specified. > When compatibility mode is off, all commands associated with a > target are executed in a single shell invocation as opposed to > the traditional one shell invocation per line. This can break > traditional scripts which change directories on each command > invocation and then expect to start with a fresh environment on > the next line. It is more efficient to correct the scripts > rather than turn backwards compatibility on. Stop using exit, cd, exec in middle of commands.