See some more info here:
https://discourse.slicer.org/t/slicer-debug-mode-buid-error-in-2017-07-23-version-on-windows-due-to-bzip2/751/2

I'll revert the bz2 related commit if nobody submits a fix till 10pm (I think that's the nightly build cutoff time).

Hi,

Cutoff time is 11pm and this is only affecting the developer build. I don't think there is a need to revert. I will address this tonight.

Thanks
Jc

This should be fixed by https://github.com/Slicer/Slicer/pull/751

Build in debug mode is still broken (even starting build completely from scratch).

Build log:
<pre>
...
Performing install step for 'python'

Microsoft (R) Build Engine version 12.0.40629.0

[Microsoft .NET Framework, version 4.0.30319.42000]

Copyright (C) Microsoft Corporation. All rights reserved.

Build started 7/25/2017 1:01:30 AM.

Project "C:\D\S4D\python-build\install.vcxproj" on node 1 (default targets).

Project "C:\D\S4D\python-build\install.vcxproj" (1) is building "C:\D\S4D\python-build\ZERO_CHECK.vcxproj" (2) on node 1 (default targets).

C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.Cpp.Platform.targets(61,5): error MSB8013: This project doesn't contain the Configuration and Platform combination of Debug|x64. [C:\D\S4D\python-build\ZERO_CHECK.vcxproj] [C:\D\S4D\python.vcxproj]

Done Building Project "C:\D\S4D\python-build\ZERO_CHECK.vcxproj" (default targets) -- FAILED.

Done Building Project "C:\D\S4D\python-build\install.vcxproj" (default targets) -- FAILED.

Build FAILED.

"C:\D\S4D\python-build\install.vcxproj" (default target) (1) ->

"C:\D\S4D\python-build\ZERO_CHECK.vcxproj" (default target) (2) ->

(PlatformPrepareForBuild target) ->

C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.Cpp.Platform.targets(61,5): error MSB8013: This project doesn't contain the Configuration and Platform combination of Debug|x64. [C:\D\S4D\python-build\ZERO_CHECK.vcxproj] [C:\D\S4D\python.vcxproj]

  0 Warning(s)

  1 Error(s)

Time Elapsed 00:00:00.56

Done Building Project "C:\D\S4D\python.vcxproj" (default targets) -- FAILED.

Done Building Project "C:\D\S4D\VTKv7.vcxproj" (default targets) -- FAILED.

Done Building Project "C:\D\S4D\ITKv4.vcxproj" (default targets) -- FAILED.

Done Building Project "C:\D\S4D\CTK.vcxproj" (default targets) -- FAILED.
...
</pre>

Updated topic: https://github.com/Slicer/Slicer/pull/751

This should address the last issues. Let me know if it works out for you.

Thank you! Testing now.

Fixed in r26174
See http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&amp;revision=26174