anchor.diff:  
   EXTRA_OECONF += "${@bb.utils.contains('DISTRO_FEATURES', 'systemd', '--with-systemdsystemunitdir=${systemd_unitdir}/system/', '--without-systemdsystemunitdir', d)}"
   
  -PACKAGECONFIG ?= "curl gmp openssl sqlite3 swanctl \
  +PACKAGECONFIG ?= "curl gmp openssl sqlite3 swanctl curve25519\
           ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'systemd-charon', 'charon', d)} \
   "
   PACKAGECONFIG[aesni] = "--enable-aesni,--disable-aesni,,${PN}-plugin-aesni"
  
positive.code: PACKAGECONFIG[sqlite3] = "--enable-sqlite,--disable-sqlite,sqlite3,${PN}-plugin-sqlite"
  PACKAGECONFIG[stroke] = "--enable-stroke,--disable-stroke,,${PN}-plugin-stroke"
  PACKAGECONFIG[swanctl] = "--enable-swanctl,--disable-swanctl,,libgcc"
  
  # requires swanctl
  PACKAGECONFIG[systemd-charon] = "--enable-systemd,--disable-systemd,systemd,"
  
negative.code:     ${PN}-plugin-x509 \
      ${PN}-plugin-xauth-generic \
      ${PN}-plugin-xcbc \
      "
  
  RPROVIDES:${PN} += "${PN}-systemd"
  