If you are compiling porta and portb which both depend on portc then an error may occur if both ports try to compile portc at the same time.
This is nothing serious, you can just restart the build, on a rare occasion you may need to manually remove a corrupted object file.
On systems with one core, the total amount of time taken to install two ports in parallel is longer than it takes when you build then serially ... On multi-core systems parallel builds (or make -j) is faster
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