I have no gradle installed and want to build it from source.

I tried to add proxy setting to the gradle.properties both in the
source root (after the checkout) and in ~/.gradle/gradle.properties
file and neither one had any effect.

The only way to build from source behind the proxy was to
set GRADLE_OPTS="-Dhttp.proxyHost=<proxy.ip> -Dhttp.proxyPort=<port?"

My expectation that wrapper should in the same way as gradle itself.