Problem building dub with LDC

[Joseph Rushton Wakeling]

Hello all,

Today I decided to download, build and install the dub package 
manager.  One clone from GitHub later, and I thought I'd try and 
build it with LDC, only to run into the following error:

$ DC=ldmd2 ./build.sh
Generating version file...
Running ldmd2...
bin/dub.o:(.rodata._D123TypeInfo_S3std8typecons86__T10RefCountedTS3std4file15DirIteratorImplVE3std8typecons24RefCountedAutoInitialize0Z10RefCounted6__initZ[_D123TypeInfo_S3std8typecons86__T10RefCountedTS3std4file15DirIteratorImplVE3std8typecons24RefCountedAutoInitialize0Z10RefCounted6__initZ]+0x60): 
undefined reference to 
`_D3std8typecons86__T10RefCountedTS3std4file15DirIteratorImplVE3std8typecons24RefCountedAutoInitialize0Z10RefCounted10__postblitMFZv'
collect2: error: ld returned 1 exit status
Error: /usr/bin/gcc failed with status: 1

Any idea what's going on here?  It looks like a problem on LDC's 
side rather than dub's.

Thanks & best wishes,

     -- Joe