Other packages up to gcc51 runtime

*** 32,42 ****
  VERHUMAN=$VER
  PKG=library/c++/sigcpp
  SUMMARY="Libsigc++ - a library that implements typesafe callback system"
  DESC="$SUMMARY"
  
! DEPENDS_IPS="system/library system/library/math system/library/g++-4-runtime"
  
  MAKE=/bin/gmake
  export MAKE
  CONFIGURE_OPTS="--includedir=/usr/include"
  
--- 32,42 ----
  VERHUMAN=$VER
  PKG=library/c++/sigcpp
  SUMMARY="Libsigc++ - a library that implements typesafe callback system"
  DESC="$SUMMARY"
  
! DEPENDS_IPS="system/library system/library/math system/library/g++-5-runtime"
  
  MAKE=/bin/gmake
  export MAKE
  CONFIGURE_OPTS="--includedir=/usr/include"