Added platform dependant external dependencies.

.gitmodules

@@ -2,5 +2,5 @@
 	path = external/tinystl
 	url = git://github.com/mendsley/tinystl.git
 [submodule "external/lodepng"]
-	path = external/lodepng
+	path = external/platform/nspire/lodepng
 	url = https://github.com/lvandeve/lodepng.git

external/platform/nspire/rules.mk

@@ -0,0 +1,5 @@
+external_LOCAL_PATH := $(call whereami)
+
+INCLUDE_EXT += $(external_LOCAL_PATH)/lodepng
+
+SRCS_CPP += $(external_LOCAL_PATH)/lodepng/lodepng.cpp

external/rules.mk

@@ -3,6 +3,4 @@ external_LOCAL_PATH := $(call whereami)
 include $(wildcard $(external_LOCAL_PATH)/*/rules.mk)
 
 INCLUDE_EXT += $(external_LOCAL_PATH)/tinystl/include
-INCLUDE_EXT += $(external_LOCAL_PATH)/lodepng
 
-SRCS_CPP += $(external_LOCAL_PATH)/lodepng/lodepng.cpp

mkconfig

@@ -6,6 +6,7 @@ create_configuration() {
 	echo "Creating $1 configuration"
 	rm config.mk -f
 	echo "include platform/$1/rules.mk" >> config.mk
+	echo "include external/platform/$1/rules.mk" >> config.mk
 }
 
 is_valid_target() {