Tweak additional flags at Iain's recommendation: -fd-verbose becomes -v -fdebug-c doesn't exist, remove (-g is still there) -fXf= becomes -Xf Replace -O3 with -O2
Tweak additional flags at Iain's recommendation:
-fd-verbose becomes -v
-fdebug-c doesn't exist, remove (-g is still there)
-fXf= becomes -Xf
Replace -O3 with -O2

Geod24/dub