I got this error:
GPU detection failed. error code 512
NVIDIA

boinc &

19-Aug-2017 17:15:27 [---] Starting BOINC client version 7.6.33 for x86_64-pc-linux-gnu
19-Aug-2017 17:15:27 [---] log flags: file_xfer, sched_ops, task
19-Aug-2017 17:15:27 [---] Libraries: libcurl/7.54.1 OpenSSL/1.1.0f zlib/1.2.11 libpsl/0.17.0 (+libicu/59.1) libssh2/1.8.0 nghttp2/1.23.1
19-Aug-2017 17:15:27 [---] Data directory: /home/wolf/workspace/boinc
19-Aug-2017 17:15:27 [---] GPU detection failed. error code 512
19-Aug-2017 17:15:27 [---] No usable GPUs found
19-Aug-2017 17:15:28 [---] Host name: wolfMachine
19-Aug-2017 17:15:28 [---] Processor: 4 GenuineIntel Intel(R) Core(TM) i5-3337U CPU @ 1.80GHz [Family 6 Model 58 Stepping 9]

boincmgr &

I'd tried all the possibles solutions in internet but nothing worked.

Run `/usr/bin/boinc` instead `boinc`


Setup and story:

You can check my scripts in these links:
https://github.com/airvzxf/archLinux-installer-and-setup/blob/master/04-setup/05a-boinc.sh
https://github.com/airvzxf/archLinux-installer-and-setup/blob/master/04-setup/05b-boinc-after-install.sh

Needs install all the Nvidia drives, OpenCL, Multilibs (lib32)

Added boinc to the correct groups

sudo usermod -a -G boinc $(whoami)
sudo gpasswd -a boinc video
reboot # Reboot your computer
groups # Check that you are in the boinc group
groups boinc # Check that boinc is in the video group

Then run the command boinc in your actual directory where are all your boinc *.xml files

/usr/bin/boinc & # Or you can use '/usr/bin/boinc_client'
boincmgr &

19-Aug-2017 17:15:58 [---] Starting BOINC client version 7.6.33 for x86_64-pc-linux-gnu
19-Aug-2017 17:15:58 [---] log flags: file_xfer, sched_ops, task
19-Aug-2017 17:15:58 [---] Libraries: libcurl/7.54.1 OpenSSL/1.1.0f zlib/1.2.11 libpsl/0.17.0 (+libicu/59.1) libssh2/1.8.0 nghttp2/1.23.1
19-Aug-2017 17:15:58 [---] Data directory: /home/wolf/workspace/boinc
19-Aug-2017 17:15:58 [---] CUDA: NVIDIA GPU 0: GeForce GT 740M (driver version 384.59, CUDA version 9.0, compute capability 3.0, 2002MB, 1855MB available, 687 GFLOPS peak)
19-Aug-2017 17:15:58 [---] OpenCL: NVIDIA GPU 0: GeForce GT 740M (driver version 384.59, device version OpenCL 1.2 CUDA, 2002MB, 1855MB available, 687 GFLOPS peak)
19-Aug-2017 17:15:58 [---] Host name: wolfMachine
19-Aug-2017 17:15:58 [---] Processor: 4 GenuineIntel Intel(R) Core(TM) i5-3337U CPU @ 1.80GHz [Family 6 Model 58 Stepping 9]

NOTE:
In fact I didn't run the boinc service, this two commands is all I need to run Boinc properly.

The name of my project is:
Arch Linux: Installer and setup
https://github.com/airvzxf/archLinux-installer-and-setup

I'm not sure why the normal install is not working for you - i guess you started from here https://wiki.archlinux.org/index.php/BOINC ?

There are some suggestions about GPU detection errors mentioned there as well.