Can profiles override plugin dependencies?

[James Kebinger]

I have a project with a plugin that depends on tools.jar. That jar doesn't
exist on the mac, so I'm trying to use profiles to change that dependency
when running on OSX. I think the pom I wrote below should work, but it
doesn't. What am i missing?
(The profile is shown as active running help:active-profiles)

thanks for your time

Here's a snippet of the pom:

<project>
...
<build>
<plugins>
<plugin>
   <artifactId>maven-antrun-plugin</artifactId>
   <executions>
   ...
   </executions>
   <dependencies>
   <dependency>
       <!-- Required to use javac -->
       <groupId>sun.jdk</groupId>
       <artifactId>tools</artifactId>
       <version>1.5</version>
       <scope>system</scope>
       <systemPath>${java.home}/../lib/tools.jar</systemPath>
   </dependency>
</dependencies>
</plugin>
</plugins>
</build>

<profiles>
     <profile>
           <id>macfixfortools</id>
           <activation>
               <os>
                     <family>OSX</family>
                </os>
           </activation>
           <build>
           <plugins>
           <plugin>
               <artifactId>maven-antrun-plugin</artifactId>
               <dependencies>
               <dependency>
                   <!-- Required to use javac -->
                   <groupId>sun.jdk</groupId>
                   <artifactId>tools</artifactId>
                   <version>1.5</version>
                   <scope>system</scope>
                   <systemPath>${java.home
}/../Classes/classes.jar</systemPath>
               </dependency>
           </dependencies>
           </plugin>
           </plugins>
           </build>
     </profile>
</profiles>