--- /usr/portage/app-arch/unrar/unrar-5.1.2.ebuild	2014-04-11 15:58:50.000000000 -0600
+++ unrar-5.1.2.ebuild	2014-04-25 09:20:11.393722984 -0600
@@ -22,10 +22,13 @@
 
 src_prepare() {
 	epatch "${FILESDIR}"/${PN}-5.0.2-build.patch
-	sed -i \
-		-e "/libunrar/s:.so:$(get_libname ${PV%.*.*}):" \
-		-e "s:-shared:& -Wl,-soname -Wl,libunrar$(get_libname ${PV%.*.*}):" \
-		makefile || die
+	local sed_args=( -e "/libunrar/s:.so:$(get_libname ${PV%.*.*}):" )
+	if [[ ${CHOST} == *-darwin* ]] ; then
+		sed_args+=( -e "s:-shared:-dynamiclib -install_name ${EPREFIX}/usr/$(get_libdir)/libunrar$(get_libname ${PV%.*.*}):" )
+	else
+		sed_args+=( -e "s:-shared:& -Wl,-soname -Wl,libunrar$(get_libname ${PV%.*.*}):" )
+	fi
+	sed -i "${sed_args[@]}" makefile
 }
 
 src_compile() {