buildroot/package/iperf/Config.in

config BR2_PACKAGE_IPERF
	bool "iperf"
	depends on BR2_INSTALL_LIBSTDCPP
	help
	  Internet Protocol bandwidth measuring tool for measuring
	  TCP/UDP performance.

	  http://dast.nlanr.net/projects/iperf/

comment "iperf requires a toolchain with C++ support enabled"
	depends on !BR2_INSTALL_LIBSTDCPP