StrongSwan is an OpenSource IPsec implementation for Linux. This SlackBuild enables configure options which are known to compile without issue on a stock Slackware 14.2 system. These options provide additional functionality and increase this packages ability to inter operate with various vendor implementations. Unwanted and/or unnecessary plugins can be disabled at run-time via the 'load' flag in /etc/strongswan.d/charon/*.conf files. The following configure options are enabled by default: --enable-shared --enable-silent-rules --enable-openssl --enable-unity --enable-curl --enable-sql --enable-sqlite --enable-cmd --enable-af-alg --enable-gcrypt --enable-aesni --enable-sha3 --enable-files --enable-lookip --enable-eap-gtc --enable-eap-md5 --enable-eap-identity --enable-eap-mschapv2 --enable-eap-tls --enable-eap-ttls --enable-eap-radius --enable-ext-auth --enable-xauth-eap --enable-coupling --enable-dnscert --enable-eap-sim --enable-eap-sim-file --enable-eap-sim-file --enable-eap-aka --enable-eap-aka-3gpp --enable-eap-simaka-sql --enable-eap-simaka-pseudonym --enable-eap-simaka-reauth --enable-attr-sql --enable-dhcp --enable-bypass-lan --enable-connmark --enable-counters --enable-farp --enable-lookip --enable-nm To disable the above options set the environment variable CONFIG_OPTS to the empty string when calling this SlackBuild. Example: env CONFIG_OPTS=" " sh ./strongswan.SlackBuild To override the defaults options set CONFIG_OPTS to your desired set of configure options. Example: env CONFIG_OPTS="--enable-openssl --enable-unity" \ sh ./strongswan.SlackBuild To add to the default options without overwriting them set the EXTRA_CONFIG_OPTS environment variable. Example: env EXTRA_CONFIG_OPTS="--enable-socket-dynamic --enable-dhcp"\ sh ./strongswan.SlackBuild Certain use cases may cause issues when bypass-lan is loaded. The SlackBuild script disables loading of the bypass-lan module. This can be changed in bypass-lan.conf after installation if required. The list of available options and their descriptions are available here: https://wiki.strongswan.org/projects/strongswan/wiki/Autoconf