diff --git a/example/inv_fizzbuzz/main.cpp b/example/inv_fizzbuzz/main.cpp
index 990c4ef9..c5882924 100644
--- a/example/inv_fizzbuzz/main.cpp
+++ b/example/inv_fizzbuzz/main.cpp
@@ -14,7 +14,7 @@
 #include <sprout/range/algorithm.hpp>
 #include <sprout/range/adaptor.hpp>
 
-static constexpr auto token_table = sprout::to_string_array<sprout::string<8> >(
+static constexpr auto token_table = sprout::make_array<sprout::string<8> >(
 	"Fizz", "Buzz", "Fizz", "Fizz", "Buzz", "Fizz", "FizzBuzz",
 	"Fizz", "Buzz", "Fizz", "Fizz", "Buzz", "Fizz"
 	);
@@ -65,7 +65,7 @@ void print(ForwardRange const& input, Pair const& answer) {
 
 int main() {
 	{
-		constexpr auto input = sprout::to_string_array<sprout::string<8> >(
+		constexpr auto input = sprout::make_array<sprout::string<8> >(
 			"Fizz", "FizzBuzz", "Fizz", "Buzz"
 			);
 		constexpr auto answer = inv_fizzbuzz(input);
@@ -74,7 +74,7 @@ int main() {
 		print(input, answer);
 	}
 	{
-		constexpr auto input = sprout::to_string_array<sprout::string<8> >(
+		constexpr auto input = sprout::make_array<sprout::string<8> >(
 			"FizzBuzz", "Fizz", "Buzz", "Fizz", "Fizz", "Buzz", "Fizz",
 			"FizzBuzz", "Fizz", "Buzz", "Fizz", "Fizz", "Buzz", "Fizz",
 			"FizzBuzz", "Fizz", "Buzz"
@@ -85,7 +85,7 @@ int main() {
 		print(input, answer);
 	}
 	{
-		constexpr auto input = sprout::to_string_array<sprout::string<8> >(
+		constexpr auto input = sprout::make_array<sprout::string<8> >(
 			"Fizz", "FizzBuzz", "Buzz"
 			);
 		constexpr auto answer = inv_fizzbuzz(input);
diff --git a/tools/darkroom/darkcult.cpp b/tools/darkroom/darkcult.cpp
index c92cec26..20e69afd 100644
--- a/tools/darkroom/darkcult.cpp
+++ b/tools/darkroom/darkcult.cpp
@@ -47,6 +47,15 @@
 #	define DARKROOM_OFFSET_Y 0
 #endif
 
+//
+// DARKROOM_RUNTIME/DARKROOM_VARIABLE
+//
+#ifndef DARKROOM_RUNTIME
+#	define DARKROOM_VARIABLE SPROUT_STATIC_CONSTEXPR
+#else
+#	define DARKROOM_VARIABLE
+#endif
+
 #include <cstddef>
 #include <iostream>
 #include <sprout/darkroom.hpp>
@@ -64,7 +73,7 @@ int main() {
 	using namespace sprout::darkroom;
 
 	typedef pixels::color_pixels<darkcult::tile_width, darkcult::tile_height>::type image_type;
-	SPROUT_STATIC_CONSTEXPR auto image = pixels::generate<image_type>(
+	DARKROOM_VARIABLE auto image = pixels::generate<image_type>(
 		darkcult::raytracer, darkcult::renderer, darkcult::camera,
 		darkcult::object, darkcult::light,
 		darkcult::offset_x, darkcult::offset_y,
diff --git a/tools/darkroom/darkcult.sh b/tools/darkroom/darkcult.sh
index 4191b5ff..8a392de9 100755
--- a/tools/darkroom/darkcult.sh
+++ b/tools/darkroom/darkcult.sh
@@ -28,11 +28,12 @@ declare -a include_paths=()
 max_procs=
 force=0
 continuable=0
+runtime=0
 use_help=0
 darkcult_cpp=$(cd $(dirname $0); pwd)/darkcult.cpp
 darkcult_py=$(cd $(dirname $0); pwd)/darkcult.py
 
-args=`getopt -o s:S:o:C:w:h:W:H:l:t:r:b:O:D:I:P:fc -l source:,stagedir:,output:,compiler:,width:,height:,tile-width:,tile-height:,left:,top:,right:,bottom:,option:,define:,include:,max-procs:,force,continuable,help -- "$@"`
+args=`getopt -o s:S:o:C:w:h:W:H:l:t:r:b:O:D:I:P:fc -l source:,stagedir:,output:,compiler:,width:,height:,tile-width:,tile-height:,left:,top:,right:,bottom:,option:,define:,include:,max-procs:,force,continuable,runtime,help -- "$@"`
 if [ "$?" -ne 0 ]; then
 	echo >&2 "error: options parse error. See 'darkcult.sh --help'"
 	exit 1
@@ -58,6 +59,7 @@ while [ -n "$1" ]; do
 		-P|--max-procs) max_procs=$2; shift 2;;
 		-f|--force) force=1; shift;;
 		-c|--continuable) continuable=1; shift;;
+		--runtime) runtime=1; shift;;
 		--help) use_help=1; shift;;
 		--) shift; break;;
 		*) echo >&2 "error: unknown option($1) used."; exit 1;;
@@ -121,6 +123,8 @@ if [ ${use_help} -ne 0 ]; then
 	echo "                              Press <Enter>; check finished."
 	echo "                              Press 'q'    ; terminate compile."
 	echo ""
+	echo "      --runtime               Enable runtime mode."
+	echo ""
 	echo "      --help                  This message."
 	exit 0
 fi
@@ -143,6 +147,7 @@ echo "  include-paths = (${include_paths[*]})"
 echo "  max-procs = ${max_procs}"
 echo "  force = ${force}"
 echo "  continuable = ${continuable}"
+echo "  runtime = ${runtime}"
 
 if [ ! -f "${src}" -a ! -f "$(cd $(dirname $0); pwd)/${src}" ]; then
 	echo >&2 "error: source(${src}) not exists."
@@ -156,6 +161,9 @@ for include_path in ${include_paths}; do
 	include_options="${include_options} -I${include_path}"
 done
 compile_options="-std=c++11 ${define_options} ${include_options} ${common_options[*]}"
+if [ ${runtime} -ne 0 ]; then
+	compile_options="${compile_options} -DDARKROOM_RUNTIME"
+fi
 
 if [ -d "${stagedir}" ]; then
 	if [ ${force} -eq 0 ]; then