DUB warnings causing failure?

["Nordlöw" via Digitalmars-d-learn]

My

https://github.com/nordlow/justd/blob/master/dub.json

fails as

WARNING: A deprecated branch based version specification is used 
for the dependency dchip. Please use numbered versions instead. 
Also note that you can still use the dub.selections.json file to 
override a certain dependency to use a branch instead.
WARNING: A deprecated branch based version specification is used 
for the dependency libnoise-d. Please use numbered versions 
instead. Also note that you can still use the dub.selections.json 
file to override a certain dependency to use a branch instead.
WARNING: A deprecated branch based version specification is used 
for the dependency vibe-d. Please use numbered versions instead. 
Also note that you can still use the dub.selections.json file to 
override a certain dependency to use a branch instead.
WARNING: A deprecated branch based version specification is used 
for the dependency gfm. Please use numbered versions instead. 
Also note that you can still use the dub.selections.json file to 
override a certain dependency to use a branch instead.
WARNING: A deprecated branch based version specification is used 
for the dependency dstats. Please use numbered versions instead. 
Also note that you can still use the dub.selections.json file to 
override a certain dependency to use a branch instead.
WARNING: A deprecated branch based version specification is used 
for the dependency hap. Please use numbered versions instead. 
Also note that you can still use the dub.selections.json file to 
override a certain dependency to use a branch instead.
Building dchip ~master configuration "library", build type debug.
Running dmd...
../../.dub/packages/dchip-master/src/dchip/cpCollision.d(350): 
Warning: instead of C-style syntax, use D-style syntax 
'MinkowskiPoint[3] hull'
FAIL 
../../.dub/packages/dchip-master/.dub/build/library-debug-linux.posix-x86_64-dmd_2067-0A8B6392623CA068032F32F74AA959F6/ 
dchip staticLibrary
Error executing command run: dmd failed with exit code 1.

Why?

Shouldn't

"buildRequirements": ["allowWarnings"],

alleviate this?