Setup for pm3 building

Makefile

@@ -1,7 +1,17 @@
 .PHONY: all clean build zip
 
-CC := gcc
-CFLAGS := -MD -Wall -g -lm -lX11 -I ./inc/
+API := x11
+
+CFLAGS := -MD -Wall -g -lm -pthread -I ./inc/
+
+ifeq ($(API), arm)	
+	CC := arm-cortexa9_neon-linux-gnueabihf-gcc
+	CFLAGS := $(CFLAGS) -D LV_TARGET_FB
+else
+	CC := gcc
+	CFLAGS := $(CFLAGS) -lX11
+endif
+
 TARGETS := pm3-lvgl
 EXES := $(patsubst %,bin/%,$(TARGETS))
 SRCS := $(shell find src inc -type f -iname '*.c')