buildroot/package/libsigc/Config.in

config BR2_PACKAGE_LIBSIGC
	bool "libsigc++"
	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # C++17
	depends on BR2_INSTALL_LIBSTDCPP
	help
	  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.

	  https://libsigcplusplus.github.io/libsigcplusplus/

comment "libsigc++ needs a toolchain w/ C++, gcc >= 7"
	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_7