Failed brew install vtk --with-qt

[bbercovici]

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• ran brew update and can still reproduce the problem?

• ran brew doctor, fixed all issues and can still reproduce the problem?

• ran brew gist-logs <formula> (where <formula> is the name of the formula that failed) and included the output link?

• if brew gist-logs didn't work: ran brew config and brew doctor and included their output with your issue?

• What you were trying to do (and why)

I was trying to re-install vtk with the qt wrappers.

• What happened (include command output)

Upong running brew install vtk --with-qt --verbose, the following error is produced

CMake Error: The source directory "/tmp/vtk-20181028-62115-ufq8h6/VTK-8.1.1/build/changes" does not exist.

See line 48 of 01.cmake for the full output

• What you expected to happen
  I was expecting the install process to proceed. I can confirm that running brew install vtk (without the --with-qt option) proceeds without trouble.
• Step-by-step reproduction instructions (by running brew install commands)
  brew install vtk --with-qt --verbose

This bug was already present when my Mac was running High Sierra. I upgraded to Mojave overnight and the same error happens. The full gist logs can be found here: https://gist.github.com/a7993fc39010b626042fd702f4529dc7

[bbercovici]

Looking more closely at 01.cmake, there is something very odd with the arguments passed to cmake :

cmake
..
-DCMAKE_C_FLAGS_RELEASE=-DNDEBUG
-DCMAKE_CXX_FLAGS_RELEASE=-DNDEBUG
-DCMAKE_INSTALL_PREFIX=/usr/local/Cellar/vtk/8.1.1_2
-DCMAKE_BUILD_TYPE=Release
-DCMAKE_FIND_FRAMEWORK=LAST
-DCMAKE_VERBOSE_MAKEFILE=ON
-Wno-dev
-DBUILD_SHARED_LIBS=ON
-DBUILD_TESTING=OFF
-DCMAKE_INSTALL_NAME_DIR:STRING=/usr/local/Cellar/vtk/8.1.1_2/lib
-DCMAKE_INSTALL_RPATH:STRING=/usr/local/Cellar/vtk/8.1.1_2/lib
-DModule_vtkInfovisBoost=ON
-DModule_vtkInfovisBoostGraphAlgorithms=ON
-DModule_vtkRenderingFreeTypeFontConfig=ON
-DVTK_REQUIRED_OBJCXX_FLAGS=''
-DVTK_USE_COCOA=ON
-DVTK_USE_SYSTEM_EXPAT=ON
-DVTK_USE_SYSTEM_HDF5=ON
-DVTK_USE_SYSTEM_JPEG=ON
-DVTK_USE_SYSTEM_LIBXML2=ON
-DVTK_USE_SYSTEM_NETCDF=ON
-DVTK_USE_SYSTEM_PNG=ON
-DVTK_USE_SYSTEM_TIFF=ON
-DVTK_USE_SYSTEM_ZLIB=ON
<<<<<<<
Updated
upstream
=======
-DVTK_WRAP_TCL=ON
-DVTK_USE_QVTK:BOOL=ON
>>>>>>>
Stashed
changes
-DVTK_WRAP_PYTHON=ON
-DPYTHON_EXECUTABLE='/usr/local/opt/python@2/bin/python2.7'
-DPYTHON_INCLUDE_DIR='/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/include/python2.7'
-DPYTHON_LIBRARY='/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/Python'
-DVTK_INSTALL_PYTHON_MODULE_DIR='/usr/local/Cellar/vtk/8.1.1_2/lib/python2.7/site-packages/'
-DVTK_QT_VERSION:STRING=5
-DVTK_Group_Qt=ON
-DVTK_WRAP_PYTHON_SIP=ON
-DSIP_PYQT_DIR='/usr/local/opt/pyqt/share/sip'

The block

<<<<<<<
Updated
upstream
=======
-DVTK_WRAP_TCL=ON
-DVTK_USE_QVTK:BOOL=ON
>>>>>>>
Stashed
changes

simply does not belong here.

Edit: brew edit vtk prints out a vtk formula with the above block. However, the vtk formula available at homebrew-core/vtk.rb does not have this block. The plot thickens...

[bbercovici]

Re-installing Homebrew solved the problem