[Building Sakai] "OutOfMemory: Permgen......" error deploying sakai 2.9.1

[Ese Egerega]

Can anyone be of help?

I successfully deployed sakai 2.9.1 on a system with 8gig RAM. I am however
getting an "OutOfMemory: Permgen......" error when I try to deploy it on a
server with 4gig RAM.

Going by the documentation sakai should run on a system with 4gig RAM.
Correct?

My environment variables are as follows:

export JAVA_HOME=/usr/lib/jvm/java-7-oracle
export PATH=$PATH:$JAVA_HOME/bin
export MAVEN_HOME=/usr
export PATH=$PATH:$MAVEN_HOME/bin
export MAVEN_OPTS="-Xms128m -Xmx512m -XX:PermSize=128m -XX:MaxPermSize=256m"
export CATALINA_HOME=/opt/tomcat
export PATH=$PATH:$CATALINA_HOME/bin
export SAKAI_HOME=/opt/tomcat/sakai
export JAVA_OPTS="-server -Xms512m -Xmx1024m -XX:PermSize=128m
-XX:MaxPermSize=512m -XX:NewSize=192m -XX:MaxNewSize=512m
-Djava.awtECHO.headless=true
-Dhttp.agent=Sakai -Dsakai.home=/opt/tomcat/sakai
-Dorg.apache.jasperRT.compiler.Parser.STRICT_QUOTE_ESCAPING=false
-Dsun.lang.ClassLoader.allowArraySyntax=true -Dcom.sun.management.jmxremote"
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