f2b/docs/install.md

Build process is quite simple:

cmake <OPTIONS> .
make

Actual list of configurable options for first line can be found at top of CMakeLists.txt. It looks like this:

option(SYMBOL "Option description" DEFAULT_VALUE)

Option can be redefined with -DSYMBOL=ON or -DSYMBOL=OFF on cmake command line.

Other noticeable options are:

• CMAKE_BUILD_TYPE (Debug, Release or unset) -- sets compiler optimization level and debugging info. Set to "Release" for production code.
• CMAKE_C_COMPILER -- allows specify another compiler
• CMAKE_INSTALL_PREFIX -- set root of install dir ($DESTDIR also will be prefixed if set).

After building you may type sudo make install to install compiled binaries and other files. Default install layout is:

/etc/f2b <- configs location
/etc/f2b/conf-available <- all available config parts
/etc/f2b/conf-enabled   <- enabled config parts
/usr/bin  <- non-root binaries
/usr/sbin <- root binaries
/usr/lib  <- loadable modules
/usr/share/f2b <- patterns collection

After install you need additional steps before configuring f2b.

cd /etc/f2b
# make symlink to patterns collection
ln -s /usr/share/f2b/filters filters
# enable some config parts
# you need at least one backend, filter and source
cd /etc/f2b/conf-enabled
ln -s ../conf-available/05-source-files.conf       ./
ls -n ../conf-available/10-backend-exec-ipset.conf ./
ln -s ../conf-available/15-filter-preg.conf        ./
# make config part for local settings
touch 99-local.conf

Now you may proceed for configuration and first launch.