have arduino imported, and RF24 compiling

Makefile.mk

@@ -0,0 +1,26 @@
+# This is the name of the file that shall be created. (It is also the name of my primary source file, without the file extension.)
+TARGET = main
+
+# create a variable that only pertains to this project
+#MY_OWN_LIBRARY_DIR = /usr/home/MJ/Arduino/libraries/mj_midi
+
+base = /home/mrh/Downloads/arduino-1.8.8-linux64/arduino-1.8.8
+
+# "EXTRAINCDIRS" is a variable used by the base makefile. The base makefile creates a -I compiler flag for every item in the "EXTRAINCDIRS" list.
+EXTRAINCDIRS = \
+	${base}/hardware/arduino/avr/libraries/SPI/src \
+	${base}/hardware/arduino/avr/cores/arduino    \
+	${base}/hardware/arduino/avr/variants/standard \
+	${base}/libraries/RF24                         \
+
+# specify *.c source files pertaining to my project
+SRC = 
+
+# specify *.cpp source files pertaining to my project
+PSRC = main.cpp 
+
+# specify additional (non-core) Arduino libraries to include
+ARDLIBS = RF24 
+
+# include my base makefile
+include ./Makefile.base