LDC2 -I option results in unresolved externals

[spikespaz]

I'm using the latest LDC2 beta, and when running the compiler 
with -I (Look for imports also in <directory>) it fails with 
unresolved externals. These are my commands.

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$ ldc2 "source\setup.d" -I "source" -J "build\vars" -of 
"build\bin\setup.exe" -m32 -g
setup.obj : error LNK2019: unresolved external symbol 
__D6common17createErrorDialogFxC9ExceptionZv referenced in 
function __Dmain
setup.obj : error LNK2019: unresolved external symbol 
__D6common14getConsoleArgsFxPuZAAya referenced in function 
__D5setup20getAvailableBrowsersFZ14__foreachbody1MFKC3std7windows8registry3KeyZi
setup.obj : error LNK2001: unresolved external symbol 
__D6common12__ModuleInfoZ
build\bin\setup.exe : fatal error LNK1120: 3 unresolved externals
Error: C:\Program Files (x86)\Microsoft Visual 
Studio\2017\BuildTools\VC\Tools\MSVC\14.15.26726\bin\HostX86\x86\link.exe failed with status: 1120

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But this next one works fine.

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$ ldc2 "source\setup.d" "source/common.d" -J "build\vars" -of 
"build\bin\setup.exe" -m32 -g

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I'm using LDC2 version 1.12.0-beta2, on DMD v2.082.0, on Windows 
with VS Build Tools 2017.
Any solutions or corrections appreciated.