I have some legacy builds which require different versions of maven and grails to be set on the PATH.

I have setup some profiles for each version of maven

PATH =  "MVN_221_DIR/bin:" + build.environment.PATH;
map.put("PATH", PATH);

and profiles to set the version of grails

PATH =  "GRAILS_136_DIR/bin:" + build.environment.PATH;
map.put("PATH", PATH);

What I would like is a final PATH which contains both changes.
"GRAILS_136_DIR/bin:MVN_221_DIR/bin:original_path"

Actual result is just:
"GRAILS_136_DIR/bin:original_path"

It looks like the results of the steps are not added until the very end of the process, so modifications and new env variables added by step 1 are not available to step 2.