Add c++ use flag to rjp

dev-libs/rjp/rjp-1.1.0.ebuild

@@ -16,11 +16,12 @@ SRC_URI="https://gitlab.com/rexy712/rjp/-/archive/${MY_PV}/rjp-${MY_PV}.tar.gz"
 LICENSE="GPL-3"
 SLOT="0/9"
 KEYWORDS="~amd64 ~x86"
-IUSE="static-libs debug"
+IUSE="static-libs debug +c++"
 
 RDEPEND=""
 DEPEND="${RDEPEND}
-        dev-util/cmake"
+        dev-util/cmake
+				c++? ( >=dev-libs/rexylib-0.2.0 )"
 BDEPEND=""
 
 src_prepare(){
@@ -30,6 +31,7 @@ src_configure(){
 	local mycmakeargs=(
 		-DENABLE_SHARED=$(usex static-libs OFF ON)
 		-DENABLE_DIAGNOSTICS=$(usex debug ON OFF)
+		-DENABLE_C++=$(usex c++ ON OFF)
 	)
 	cmake-multilib_src_configure
 }