ROOT 6.22.02 installation error: cannot find


I am trying to install ROOT 6.22.02. The cmake compilation runs fine but right at the end I get this error:

CMake Error at core/clingutils/cmake_install.cmake:51 (file):
  file INSTALL cannot find "/usr/local/build_root/lib/": No
  such file or directory.
Call Stack (most recent call first):
  core/cmake_install.cmake:70 (include)
  cmake_install.cmake:205 (include)

gmake: *** [Makefile:129: install] Error 1

Can somebody please guide me on how to resolve this error?

ROOT Version: 6.22.02
Platform: Ubuntu 19.10
Compiler: 9.3

Hi @uzair90,
can you please share the full output of the cmake configuration (including the command you use to configure the build) and also possibly some lines around/before the error message appears?

Also note that unless you have specific needs you don’t need to compile ROOT from source, there are several more painless installation methods listed at , e.g. you could install ROOT as a conda package.

Hope this helps!

Hello @eguiraud,

I use this first command to configure:

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/build_root /usr/local/root-6.22.02/ -Dminuit2=ON

And I use this to run the installation by the second command:

cmake --build . -- install -j4

I have attached the output of the two commands for your reference.

I saw the conda install option recently. I am not a python use so I was not aware of that. I use ROOT in conjunction with some other softwares/simulations. If I install ROOT from conda would I still have access to this environment variable: export ROOTSYS=/usr/local/build_root
command2_output.txt (960.1 KB)
command1_output.txt (11.9 KB)

Uhm sorry I cannot tell what the problem is, maybe @Axel or @oshadura have an idea.

As a workaround you can install via conda or also just use the pre-compiled binaries, see .


Traditionally, /usr/local/ isn’t a user-writable directory, this should only be written to by the superuser (user root); as such you might want to build in your home directory as a regular user and then run sudo cmake --build . install -j4 after cmake --build . -j4 (without sudo).

That said: do you have /usr/local/build_root/lib/ Your log says [ 77%] Linking CXX shared library ../../lib/ which should have created it. What does ls -l /usr/local/build_root/lib/ show?

Hell @Axel,

That is true. Traditionally /usr/local is not a user-writable directory. However, in my case I have made it as such so that I have full permissions to write in it as a user so that I do not have use sudo or su.

If I do ls -l /usr/local/build_root/lib/ there is no such file. However, I do find this file:

ls -l /usr/local/build_root/lib/libvectorDict.rootmap -rw-rw-r-- 1 uzairlatif uzairlatif 427 Nov 10 12:49 /usr/local/build_root/lib/libvectorDict.rootmap

I would like to add that I did find this other post for a user who had a similar problem: Error with

However, the binary pointed out there was for GCC 9.2 and I have GCC 9.3.

Super weird - CMake tells us that it built yet now it’s gone. What happens if you re-run cmake --build . -- install -j4? Say a couple of times? Does it state Linking CXX shared library ../../lib/ all the time? Do you ever see /usr/local/build_root/lib/ being generated?

Hello @Axel ,

So when I re-ran the command: cmake --build . -- install -j4 three times and each time I got the same error with this message: [ 77%] Linking CXX shared library ../../lib/ . is never generated. Let me know what else I can try.

I also made a mistake earlier in reporting what OS I have. I Ubuntu 20.04 LTS not 19.10.

OK that’s good - it’s a reproducible error! Please run cmake --build . -- vectorDict VERBOSE=1 > make.log 2>&1 and upload the file make.log. Thanks!

make.txt (241.0 KB)

I have attached the make.log file for your reference. I was not allowed to upload a file with *.log extension so I changed the extension to *.txt.

Thanks. CMake says it has created a file /usr/local/build_root/core/clingutils/../../lib/ If you ls -l that, what does that show?

Yes! The file is finally there when I do ls -l in the /lib folder.

-rwxrwxr-x 1 uzairlatif uzairlatif 144160 Nov 11 13:46

So next time if it happens again should I just run the command: cmake --build . -- vectorDict to build the file?

Thank you so much for your help!

Hmm, well, that solves it for you but not for me - I still don’t understand why the file was removed after it got created. But okay, solve for you, and we will debug this once we see this on our machines!

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