add dosbox shim

utils/dosbox_shim/Makefile

@@ -0,0 +1,51 @@
+OS := $(shell uname -s)
+
+ifeq ($(OS), FreeBSD)
+  CC=cc
+  CFLAGS=-I/usr/local/include
+  LDFLAGS=-L/usr/local/lib 
+endif
+ifeq ($(OS), DragonFly)
+  CC=cc
+  CFLAGS=-I/usr/local/include -I/usr/local/include/ncurses
+  LDFLAGS=-L/usr/local/lib 
+endif
+ifeq ($(OS), NetBSD)
+  CC=cc
+  CFLAGS=-I/usr/pkg/include
+  LDFLAGS=-R/usr/pkg/lib -L/usr/pkg/lib 
+endif
+ifeq ($(OS), OpenBSD)
+  CC=cc
+  CFLAGS=-I/usr/local/include
+  LDFLAGS=-L/usr/local/lib 
+endif
+ifeq ($(OS), Linux)
+  CC=gcc
+  CFLAGS=
+  LDFLAGS=
+endif
+ifeq ($(OS), Darwin)
+  CC=cc
+  CFLAGS=
+  LDFLAGS=
+endif
+ifeq ($(OS), SunOS)
+  CC=gcc
+  CFLAGS=
+  LDFLAGS=
+endif
+
+DEPS = main.c
+
+OBJ = main.o
+%.o: %.c $(DEPS)
+	$(CC) -c -o $@ $< $(CFLAGS) 
+
+shim: $(OBJ)
+	$(CC) -o $@ $^  $(CFLAGS) $(LDFLAGS)
+
+.PHONY: clean
+
+clean:
+	rm -f $(OBJ) shim