Problem with Ant property references

Hello,

I have an ant file with the following line:
<ant antfile="$/build/build.xml" target="clean-all" inheritall="false" /> In my build.properties I have defined something=${env.PROJECT_HOME}/module I use Idea 5.1.1. env.PROJECT_HOME is defined in global environment and as an ant property. Properties file is found by ant. Ant marks the attributes red and says: Cannot resolve symbol: $/build/build.xml
Cannot resolve symbol: clean-all

Does anyone have a hint?

Jochen