$ export SONAR_SCANNER_HOME=${TRAVIS_HOME}/.sonarscanner/sonar-scanner
Preparing build wrapper for SonarSource C/C++ plugin
curl: (60) server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
More details here: http://curl.haxx.se/docs/sslcerts.html
curl performs SSL certificate verification by default, using a "bundle"
of Certificate Authority (CA) public keys (CA certs). If the default
bundle file isn't adequate, you can specify an alternate file
using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
the bundle, the certificate verification probably failed due to a
problem with the certificate (it might be expired, or the name might
not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
the -k (or --insecure) option.
[...]
The command "eval curl -sSLo $sq_build_wrapper_dir/build-wrapper-linux-x86.zip https://sonarcloud.io/static/cpp/build-wrapper-linux-x86.zip " failed 3 times.