If you run these commands, you'll have a build failure:
tar -zxf confluence-2.1.4-source.tar.gz
cd confluence-2.1.4-source/confluence
maven war

The failures are for these jar files, and they make it impossible to build from source and install the new version:
atlassian-mail-1.3.14.jar
atlassian-core-2.4.2.jar
atlassian-bucket-2006.01.06.jar
atlassian-extras-0.7.15.jar
atlassian-user-0.6.0c.jar
atlassian-renderer-2006.02.15.jar
seraph-0.7.16.jar
dwr-1.1b2-atlassian-2006-01-12.jar
hibernate-2.1.8-atlassian.jar
oscache-2.2.jar
osuser-atl.user.jar
pdfbox-0.7.2.jar
rome-0.6-patched.jar
xmlrpc-2.0+xmlrpc61.jar
xpp3-1.1.3.4d_b4_min.jar
jcommon-1.0.0.jar
selenium-0.6-atlassian-2005.12.15.jar