Funny, I get the same errors when compiling vibe using dub.
I'm on arch linux, using dub-git and dmd 2.063.
The errors I'm getting are :
../../../../.dub/packages/vibe-d-0.7.15/source/vibe/vpm/installation.d(35): Warning: const field with initializer should be static, gshared, or an enum
../../../../.dub/packages/vibe-d-0.7.15/source/vibe/core/file.d(60): Warning: explicit element-wise assignment templ[16LU..
dollar - 1LU] = (suffix)[] is better than templ[16LU..__dollar - 1LU] = suffix

Should I downgrade dmd?