Minor changes to keep MAC OSX happy

Makefile

@@ -11,6 +11,8 @@ ARCH= -gencode arch=compute_30,code=sm_30 \
       -gencode arch=compute_52,code=[sm_52,compute_52] \
 	  -gencode arch=compute_61,code=[sm_61,compute_61]
 
+OS := $(shell uname)
+
 # Tesla V100
 # ARCH= -gencode arch=compute_70,code=[sm_70,compute_70]
 
@@ -65,14 +67,23 @@ endif
 ifeq ($(GPU), 1)
 COMMON+= -DGPU -I/usr/local/cuda/include/
 CFLAGS+= -DGPU
+ifeq ($(OS),Darwin) #MAC
+LDFLAGS+= -L/usr/local/cuda/lib -lcuda -lcudart -lcublas -lcurand
+else
 LDFLAGS+= -L/usr/local/cuda/lib64 -lcuda -lcudart -lcublas -lcurand
 endif
+endif
 
 ifeq ($(CUDNN), 1)
 COMMON+= -DCUDNN
+ifeq ($(OS),Darwin) #MAC
+CFLAGS+= -DCUDNN -I/usr/local/cuda/include
+LDFLAGS+= -L/usr/local/cuda/lib -lcudnn
+else
 CFLAGS+= -DCUDNN -I/usr/local/cudnn/include
 LDFLAGS+= -L/usr/local/cudnn/lib64 -lcudnn
 endif
+endif
 
 OBJ=http_stream.o gemm.o utils.o cuda.o convolutional_layer.o list.o image.o activations.o im2col.o col2im.o blas.o crop_layer.o dropout_layer.o maxpool_layer.o softmax_layer.o data.o matrix.o network.o connected_layer.o cost_layer.o parser.o option_list.o darknet.o detection_layer.o captcha.o route_layer.o writing.o box.o nightmare.o normalization_layer.o avgpool_layer.o coco.o dice.o yolo.o detector.o layer.o compare.o classifier.o local_layer.o swag.o shortcut_layer.o activation_layer.o rnn_layer.o gru_layer.o rnn.o rnn_vid.o crnn_layer.o demo.o tag.o cifar.o go.o batchnorm_layer.o art.o region_layer.o reorg_layer.o reorg_old_layer.o super.o voxel.o tree.o
 ifeq ($(GPU), 1) 

src/demo.c

@@ -66,7 +66,7 @@ void *fetch_in_thread(void *ptr)
         //error("Stream closed.");
 		printf("Stream closed.\n");
 		flag_exit = 1;
-		return;
+		return EXIT_FAILURE;
     }
     //in_s = resize_image(in, net.w, net.h);
 	in_s = make_image(in.w, in.h, in.c);