Bug#793304: vtk6: FTBFS on arm*: qt4 not found

[Emilio Pozuelo Monfort]

Source: vtk6
Version: 6.2.0+dfsg1-1
Severity: serious

The latest vtk6 upload fails to build on arm*. That seems to be because
d/rules contains:

qt4_archs = armel armhf
ifeq (,$(filter $(DEB_HOST_ARCH),$(qt4_archs)))
	extra_flags += -DVTK_QT_VERSION=5
else
	extra_flags += -DVTK_QT_VERSION=4
endif

Reason:

vtk6 (6.1.0+dfsg2-2) unstable; urgency=medium

  * [463aa5a] Use Qt4 on armel and armhf instead of Qt5. (Closes: #763763)

However the last upload contained this change:

  * [880e68d] Remove Qt4 dependencies. (Closes: #784557, #765491)


So I guess vtk6 should build with qt5 on arm* again.

Please fix this ASAP as it's blocking the ongoing vtk6 transition and the
ffmpeg one, and it will get tangled with the libstdc++ one when that starts.

Emilio