On Friday, 31 May 2019 at 10:27:44 UTC, Anonymouse wrote: >> $ grep dflags dub.json >> "dflags": [ "-lowmem", "--DRT-gcopt=profile:1" ], This should work indeed. I guess it doesn't because dub probably uses a response file containing all cmdline options, whereas -lowmem definitely [and --DRT-* probably] need to be direct cmdline args.