gistfile1.sh

cd src/hadoop-lzo
tar xzvf ~/Downloads/lzo-2.05.tar.gz
cd lzo-2.05
CFLAGS="-arch x86_64" ./configure --build=x86_64-darwin --enable-shared --disable-asm --prefix=$HOME/hadoop-0.20.2/lzo
make -j4
make install
cd ..
env \
  JAVA_HOME=/Library/Java/Home \
  C_INCLUDE_PATH=$HOME/hadoop-0.20.2/lzo/include \
  LIBRARY_PATH=$HOME/hadoop-0.20.2/lzo/lib \
  CFLAGS="-arch x86_64" \
  ant clean compile-native test tar
mkdir ~/hadoop-0.20.2/lib/native/Mac_OS_X-x86_64-64
cp build/native/Mac_OS_X-x86_64-64/lib/* ~/hadoop-0.20.2/lib/native/Mac_OS_X-x86_64-64/
cp build/hadoop-lzo-0.4.12.jar ~/hadoop-0.20.2/lib/

Edit ~/hadoop-0.20.2/conf/core-site.xml and add:
  <property>
    <name>io.compression.codecs</name>
    <value>org.apache.hadoop.io.compress.GzipCodec,org.apache.hadoop.io.compress.DefaultCodec,com.hadoop.compression.lzo.LzoCodec,com.hadoop.compression.lzo.LzopCodec,org.apache.hadoop.io.compress.BZip2Codec</value>
  </property>
  <property>
    <name>io.compression.codec.lzo.class</name>
    <value>com.hadoop.compression.lzo.LzoCodec</value>
  </property>