Warning: CVS sources are for advanced users: it may not compile or not be stable. You're warned!
To get CVS sources, issue this command:
$
cvs -z3 -d:pserver:anonymous@cvs.savannah.nongnu.org:/sources/weechat co weechat
Execute this script:
./autogen.sh
Then follow instructions for source package (see the section called “Source package”)