Most of the documentation is a snapshot of the old Namesys site (archive.org, 2007-09-29).
There was also a Reiser4 Wiki (archive.org, 2007-07-06) once on pub.namesys.com.
Reiser4 development appears to have stalled and ReiserFS is deprecated and scheduled to be removed from mainline Linux in 2025.
Reiser4progs
From Reiser4 FS Wiki
The tools to maintain a Reiser4 filesystem are called reiser4progs and can be found on Sourceforge.
To compile reiser4progs, we'll need libaal too:
wget http://downloads.sourceforge.net/project/reiser4/reiser4-utils/libaal/libaal-1.0.5.tar.gz tar -xzf libaal-1.0.5.tar.gz cd libaal-1.0.5 ./configure --prefix=/opt/libaal make && sudo make install
Now we can build reiser4progs:
sudo apt-get install libreadline-dev uuid-dev # Debian, Ubuntu sudo apt-get install readline-devel libuuid-devel # openSUSE, Fedora wget http://downloads.sourceforge.net/project/reiser4/reiser4-utils/reiser4progs/reiser4progs-1.0.7.tar.gz tar -xzf reiser4progs-1.0.7.tar.gz cd reiser4progs-1.0.7 CFLAGS="-I/opt/libaal/include" LDFLAGS="-L/opt/libaal/lib" ./configure --prefix=/opt/reiser4progs make && sudo make install
Note: use LDFLAGS="-L/opt/libaal/lib" for 64 bit systems!