Prior to building libabac you must install libstrongswan. Download strongswan-4.4.0 from strongswan.org: http://download.strongswan.org/strongswan-4.4.0.tar.bz2 $ tar xjvf strongswan-4.4.0.tar.bz2 $ cd strongswan-4.4.0 $ ./configure --enable-monolithic $ cd src/libstrongswan $ make && sudo make install Be sure to make note of the directory into which you've untarred strongswan-4.4.0.tar.bz2. You will use this in the next step. BUILDING LIBABAC $ ./configure --with-strongswan=$STRONGSWAN_SRC_DIR $ make && sudo make install