Could not perform XLST transformation

by Hui Wang

When I am trying to realize my first project with this tutorial under the symfony framework, I met this error.

cause: php symfony propel-build-model

error:[propel-om] Could not perform XLST transformation.  Make sure PHP has been compiled/configured to support XSLT.

analyze:  the xlst module was not  enabled during php installation

solution: sudo apt-get install php5-xsl