config BR2_PACKAGE_LIBSIGC
depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
depends on BR2_INSTALL_LIBSTDCPP
libsigc++ implements a typesafe callback system for standard
C++. It allows you to define signals and to connect those
signals to any callback function, either global or a member
function, regardless of whether it is static or virtual.
http://libsigc.sourceforge.net/
comment "libsigc++ needs a toolchain w/ C++, gcc >= 4.8"
depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8