[Hadoop Wiki] Trivial Update of "QwertyManiac/BuildingHadoopTrunk" by QwertyManiac

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The "QwertyManiac/BuildingHadoopTrunk" page has been changed by QwertyManiac:
http://wiki.apache.org/hadoop/QwertyManiac/BuildingHadoopTrunk?action=diff&rev1=1&rev2=2

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    3. On Ubuntu, do {{{apt-get install protobuf}}}
    4. (The list can go on, but you get the idea, and you have access to a web search engines…)
    5. Do ensure the version is right with a {{{protoc --version}}}
- 3. '''Optional''': Install all the usual build essentials like '''gcc''', '''autoconf''', '''make''', '''zlib''', etc. for various native-code components you may want to hack on.
+ 3. '''Optional''': Install all the usual build/development essentials like '''gcc''', '''autoconf''', '''automake''', '''make''', '''zlib''', etc. for various native-code components you may want to hack on.
  4. Enter the top level checkout directory ({{{hadoop}}}) and issue {{{mvn install -DskipTests}}} to kick off the compile.