add minimal support for MSys

Makefile

@@ -1,6 +1,26 @@
-CFLAGS?=-O2 -g -Wall -W $(shell pkg-config --cflags librtlsdr)
+CFLAGS?=-O2 -g -Wall -W 
 CFLAGS+= -I./aisdecoder -I ./aisdecoder/lib
-LDFLAGS+=$(shell pkg-config --libs librtlsdr) -lpthread -lm
+LDFLAGS+=-lpthread -lm
+
+UNAME := $(shell uname)
+ifeq ($(UNAME),Linux)
+
+#Conditional for Linux
+CFLAGS+= $(shell pkg-config --cflags librtlsdr)
+LDFLAGS+=$(shell pkg-config --libs librtlsdr)
+
+else
+
+#Conditional for Windows
+#### point this to your correct path ###
+RTLSDR_PATH="/c/tmp/rtl-sdr/"
+RTLSDR_LIB=$(RTLSDR_PATH)/build/src/
+########################################
+CFLAGS+=-I $(RTLSDR_PATH)/include
+LDFLAGS+=-L $(RTLSDR_LIB) -L/usr/lib -lusb-1.0 -lrtlsdr -lWs2_32
+
+endif
+
 CC?=gcc
 SOURCES= \
 	rtl_ais.c convenience.c \