Building mongodb 3.6.8 takes about 15GB of disk space on macOS. This has been a problem for the MacPorts project's build farm, which I administer, because our build machines don't always have that much disk space available.

It's hard to imagine what all that disk space is being used for, since the total size of everything that actually ends up getting installed is under 200MB. I have not yet had an opportunity to try building mongodb 4, but assuming the build system hasn't changed that much, is there a way to reduce how much disk space it uses to build? Or are there any flags to tell the build system to clean up intermediate files as it goes along?