https://github.com/ValveSoftware/Proton/blob/c27354dac64f1f8f144171110c0b256a5384509c/build/makefile_base.mak#L1241
Just a small fix I noticed, there are duplicates:
$(WINEMAKER) --nosource-fix --nolower-include --nodlls --nomsvcrt \ --nosource-fix --nolower-include --nodlls --nomsvcrt \
Nothing extracted yet.
https://github.com/ValveSoftware/Proton/blob/c27354dac64f1f8f144171110c0b256a5384509c/build/makefile_base.mak#L1241
Just a small fix I noticed, there are duplicates: