[Insight-users] [ITK Community] About some basic problems and doubts

[Brian Helba]

Hi Ujjwal,

To be clear, when you say that you "installed" ITK / VTK, I'm assuming that
you mean that after running "make", you ran "make install" (or more
probably "sudo make install").

If this is the case, then the installation copied the built ITK/VTK
libraries, header files, CMake configuration, etc. to standard locations on
your system. Typically, you can run "[sudo] make uninstall" from your build
directory to then delete these files, but since you already deleted the
build directory, you'll have to remove them manually. I don't have the full
list of install paths in front of me at the moment, but if you can't find
the files yourself, feel free to make a follow-up post (including what
Linux distribution you're using), and I or someone else will try and post
them for you. Assuming that ITK / VTK follow the FHS [1], "/usr/local" is
probably a good place to start looking.

This is the reason why your new programs are still pointing to the old
version of ITK: it is still installed and is being located before the new
version. By requiring version 4.5, you are forcing CMake to continue the
search even after it finds 4.4.

--

As for OpenCV, if you don't need to use it for any of your programs, I
would recommend just configuring and building ITK with
Module_ITKOpenCVBridge disabled.

--

Finally, note that installing ITK / VTK is not really necessary most of the
time. You can simply build ITK / VTK somewhere in your home directory, and
then manually add the "ITK_DIR" or "VTK_DIR" CMake configuration variable
to any of your own projects that have the "find_package(ITK ...)" /
"find_package(VTK ...)" line in their CMakeLists.txt. Set the value of
"ITK_DIR" / "VTK_DIR" to be the path to the directory of your ITK / VTK
build.

Despite having to manually add the extra CMake variable when first
configuring a new project (although even this can be automated with
environment variables), this is sometimes more convenient overall, as you
can rebuild ITK / VTK with new options any time, without having to
reinstall it (which requires root privledges) and there is no uninstall
step to worry about if you no longer need ITK / VTK or want to make a fresh
build.

[1] http://www.pathname.com/fhs/

Hope this helps,
Brian



On Fri, Feb 14, 2014 at 9:22 AM, UJJWAL aryan <meetukme at gmail.com> wrote:

> Hi,
>
> I installed VTK-6.1.0 and ITK-4.5 on my system (Ubuntu 13.04) . Before
> that, ITK-4.4 and VTK-5.10 were installed on my system.
> In order to remove them, I simply removed the build folders from which I
> had run cmake during their installation (this method of removal was
> suggested to me in the mailing list a long time back).
>
> After I installed ITK-4.5 and VTK-6.1.0, I faced the following issues :
>
>  When trying to compile a trivial ITK test program, it failed to link
> because
>  find_package(ITK REQUIRED) was still pointing to UseITK.cmake file
> correspondin g to ITK-4.4 and not ITK-4.5. Finally in order to solve it, I
> wrote find_package(ITK 4.5 REQUIRED)
> My first question is :
>   1. Why did it continue pointing to ITK-4.4 ? What is the correct way to
> remove previous versions of libraries so that all their traces are gone and
> there are no such conflicting links ?
>
> 2.  Even after solving this problem, it fails to link because it cannot
> find any opencv libraries.  I compiled ITK with support for
> ITKOPencvBridge. However in the test code, I have not used anything even
> remotely concerned with OpenCV. Even in my CMakeLists.txt file, I have not
> called Opencv at all. Then why is it trying to link to Opencv  ?
> Why is it not able to find those libraries when they are in
> usr/local/lib/opencv and /usr/local/lib/opencv2 ? About this, on further
> probing I found that  opencv.pc file is present in pkg-config folder which
> describes the package opencv perfectly.
> Running Opencv test programs showed that OpenCv is installed properly.
>
> 3. How do I detect any traces of old and unused and unnecessary library
> files left in my system and remove them without disturbing the rest of the
> system ?
>
>
> It might be that some of my questions are too basic or trivial. But I am
> not an expert in Linux and any help and patient support  would be deeply
> appreciated
>
> --
> Ujjwal
>
>
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-- 
Brian Helba
Medical Imaging
Kitware, Inc.
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