diff --git a/media-libs/arc-mesa/arc-mesa-9999.ebuild b/media-libs/arc-mesa/arc-mesa-9999.ebuild
index cde8ecf..7c946e6 100644
--- a/media-libs/arc-mesa/arc-mesa-9999.ebuild
+++ b/media-libs/arc-mesa/arc-mesa-9999.ebuild
@@ -73,8 +73,9 @@
 # Think about: ggi, fbcon, no-X configs
 
 driver_list() {
-	local drivers="$(sort -u <<< "${1// /$'\n'}")"
-	echo "${drivers//$'\n'/,}"
+	local uniq_driver=($(printf "%s\n" "$@" | sort -u))
+	local IFS=,
+	echo "${uniq_driver[*]}"
 }
 
 pkg_setup() {
@@ -320,9 +321,9 @@
 		$(meson_use gles2)
 		$(meson_use selinux)
 		$(meson_use shared-glapi)
-		-Ddri-drivers=$(driver_list "${DRI_DRIVERS[*]}")
-		-Dgallium-drivers=$(driver_list "${GALLIUM_DRIVERS[*]}")
-		-Dvulkan-drivers=$(driver_list "${VULKAN_DRIVERS[*]}")
+		-Ddri-drivers=$(driver_list "${DRI_DRIVERS[@]}")
+		-Dgallium-drivers=$(driver_list "${GALLIUM_DRIVERS[@]}")
+		-Dvulkan-drivers=$(driver_list "${VULKAN_DRIVERS[@]}")
 		--buildtype $(usex debug debug release)
 		$(use cheets && echo "--cross-file=${ARC_CROSS_FILE}")
 		$(use cheets && echo "-Dplatform-sdk-version=${ARC_PLATFORM_SDK_VERSION}")
@@ -510,14 +511,12 @@
 	case $# in
 		# for enabling unconditionally
 		1)
-			DRI_DRIVERS+=",$1"
+			DRI_DRIVERS+=("$1")
 			;;
 		*)
 			if use $1; then
 				shift
-				for i in $@; do
-					DRI_DRIVERS+=",${i}"
-				done
+				DRI_DRIVERS+=("$@")
 			fi
 			;;
 	esac
@@ -527,14 +526,12 @@
 	case $# in
 		# for enabling unconditionally
 		1)
-			GALLIUM_DRIVERS+=",$1"
+			GALLIUM_DRIVERS+=("$1")
 			;;
 		*)
 			if use $1; then
 				shift
-				for i in $@; do
-					GALLIUM_DRIVERS+=",${i}"
-				done
+				GALLIUM_DRIVERS+=("$@")
 			fi
 			;;
 	esac
@@ -544,14 +541,12 @@
 	case $# in
 		# for enabling unconditionally
 		1)
-			VULKAN_DRIVERS+=",$1"
+			VULKAN_DRIVERS+=("$1")
 			;;
 		*)
 			if use $1; then
 				shift
-				for i in $@; do
-					VULKAN_DRIVERS+=",${i}"
-				done
+				VULKAN_DRIVERS+=("$@")
 			fi
 			;;
 	esac