Create a new file /Library/LaunchDaemons/setenv.M2_HOME.plist:
<? xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>setenv.BAR</string>
<key>ProgramArguments</key>
<array>
<string>/bin/launchctl</string>
<string>setenv</string>
<string>M2_HOME</string>
<string>/opt/local/share/java/apache-maven-3.1.1</string>
</array>
<key>RunAtLoad</key>
<true/>
<key>ServiceIPC</key>
<false/>
</dict>
</plist>
launchctl load -w /Library/LaunchDaemons/setenv.M2_HOME.plist
IDEA, MAVEN_HOME. 10.10.3.
: http://lajosd.blogspot.be/2015/06/place-following-content-enhance-it-to.html