以前osx的全局变量可以通过~/.MacOSX/envrironment.plist文件来设置，现在Mountain lion后就不行了。现在的文件换成/etc/launchd.conf 可以使用一下方法来设置：
1) Open a terminal prompt
2) Type sudo vi /etc/launchd.conf (note: this file might not yet exist)
3) Put contents like the following into the file
# Set environment variables here so they are available globally to all apps
# (and Terminal), including those launched via Spotlight.
#
# After editing this file run the following command from the terminal to update
# environment variables globally without needing to reboot.
# NOTE: You will still need to restart the relevant application (including # Terminal) to pick up the changes! # grep -E "^setenv" /etc/launchd.conf | xargs -t -L 1 launchctl
#
# See http://www.digitaledgesw.com/node/31
# and http://stackoverflow.com/questions/135688/setting-environment-variables-in-os-x/
# # Note that you must hardcode the paths below, don't use enviroment variables.
# You also need to surround multiple values in quotes, see MAVEN_OPTS example below.
#
setenv JAVA_VERSION 1.6
setenv JAVA_HOME /System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home
setenv GROOVY_HOME /Applications/Dev/groovy
setenv GRAILS_HOME /Applications/Dev/grails
setenv NEXUS_HOME /Applications/Dev/nexus/nexus-webapp
setenv JRUBY_HOME /Applications/Dev/jruby
setenv ANT_HOME /Applications/Dev/apache-ant setenv ANT_OPTS -Xmx512M setenv MAVEN_OPTS "-Xmx1024M -XX:MaxPermSize=512m"
setenv M2_HOME /Applications/Dev/apache-maven
setenv JMETER_HOME /Applications/Dev/jakarta-jmeter
4) Save your changes in VI and reboot your Mac. Or use the grep/xargs command show in the code comment above.
如果不想手动修改文件，则可以使用
launchctl setenv PATH /opt/local/bin:/opt/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin
来进行修改。
