Build requires maven version greater then  2.0.11 but this is not declared
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                 Key: ACE-94
                 URL: https://issues.apache.org/jira/browse/ACE-94
             Project: Ace
          Issue Type: Improvement
          Components: Maven Build
         Environment: Apache Maven 2.0.11 (r909250; 2010-02-12 06:55:50+0100)
Java version: 1.6.0_21
Java home: C:\Program Files (x86)\Java\jdk1.6.0_21\jre
Default locale: nl_NL, platform encoding: Cp1252
OS name: "windows 7" version: "6.1" arch: "x86" Family: "windows"
            Reporter: Bram de Kruijff
            Priority: Minor


When you try to build the trunk at r1022542 using Maven 2.0.11 you get the 
following non-helpfull error right at the start of the build:

[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Unable to initialise extensions
Component descriptor role: 'org.apache.maven.wagon.CommandExecutor', 
implementation: 
'org.apache.maven.wagon.providers.ssh.external.ScpExternalCommandExecutor',
 role hint: 'scpexe' has a hint, but there are other implementations that don't

It seems the build requires a Maven version greater then 2.0.11 (not sure which 
one exactly) but this message does not make that clear for the average Jonh 
Doe. Therefore I suggest adding a small prerequisites section in the root pom 
that will make people happy. This will still cause the build to fail, but this 
time with the nice and informative message:

[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Unable to build project 'c:\bramk\amdatu\svn\ace-trunk\pom.xml; it 
requires Maven version 2.2.1 

The relevant snippet to add would (assuming 2.2.1) be:

    <prerequisites>
        <maven>2.2.1</maven>
    </prerequisites>


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