darknet patch to use GPU

diff --git a/Makefile b/Makefile
index 63e15e6..3955f12 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,17 @@
-GPU=0
-CUDNN=0
-OPENCV=0
-OPENMP=0
+GPU=1
+CUDNN=1
+OPENCV=1
+OPENMP=1
 DEBUG=0

-ARCH= -gencode arch=compute_30,code=sm_30 \
-      -gencode arch=compute_35,code=sm_35 \
-      -gencode arch=compute_50,code=[sm_50,compute_50] \
-      -gencode arch=compute_52,code=[sm_52,compute_52]
-#      -gencode arch=compute_20,code=[sm_20,sm_21] \ This one is deprecated?
+ARCH= -gencode=arch=compute_60,code=sm_60 \
+      -gencode=arch=compute_61,code=sm_61 \
+      -gencode=arch=compute_70,code=sm_70 \
+      -gencode=arch=compute_75,code=sm_75 \
+      -gencode=arch=compute_80,code=sm_80 \
+      -gencode=arch=compute_86,code=sm_86 \
+      -gencode=arch=compute_89,code=sm_89 \
+      -gencode=arch=compute_89,code=compute_89

 # This is what I use, uncomment if you know your arch and want to specify
 # ARCH= -gencode arch=compute_52,code=compute_52
@@ -42,8 +45,8 @@ CFLAGS+=$(OPTS)
 ifeq ($(OPENCV), 1)
 COMMON+= -DOPENCV
 CFLAGS+= -DOPENCV
-LDFLAGS+= `pkg-config --libs opencv` -lstdc++
-COMMON+= `pkg-config --cflags opencv`
+LDFLAGS+= `pkg-config --libs opencv4` -lstdc++
+COMMON+= `pkg-config --cflags opencv4`
 endif

 ifeq ($(GPU), 1)
diff --git a/src/image_opencv.cpp b/src/image_opencv.cpp
index 7511280..04103a8 100644
--- a/src/image_opencv.cpp
+++ b/src/image_opencv.cpp
@@ -9,31 +9,35 @@ using namespace cv;

 extern "C" {

-IplImage *image_to_ipl(image im)
-{
+Mat image_to_mat(image im)
+ {
+    assert(im.c == 3 || im.c == 1);
     int x,y,c;
-    IplImage *disp = cvCreateImage(cvSize(im.w,im.h), IPL_DEPTH_8U, im.c);
-    int step = disp->widthStep;
-    for(y = 0; y < im.h; ++y){
-        for(x = 0; x < im.w; ++x){
-            for(c= 0; c < im.c; ++c){
-                float val = im.data[c*im.h*im.w + y*im.w + x];
-                disp->imageData[y*step + x*im.c + c] = (unsigned char)(val*255);
-            }
-        }
-    }
-    return disp;
-}
+    image copy = copy_image(im);
+    constrain_image(copy);
+    if(im.c == 3) rgbgr_image(copy);
+    Mat m(im.h, im.w, CV_MAKETYPE(CV_8U, im.c));
+     for(y = 0; y < im.h; ++y){
+         for(x = 0; x < im.w; ++x){
+             for(c= 0; c < im.c; ++c){
+                float val = copy.data[c*im.h*im.w + y*im.w + x];
+                m.data[y*im.w*im.c + x*im.c + c] = (unsigned char)(val*255);
+             }
+         }
+     }
+    free_image(copy);
+    return m;
+ }

-image ipl_to_image(IplImage* src)
-{
-    int h = src->height;
-    int w = src->width;
-    int c = src->nChannels;
-    image im = make_image(w, h, c);
-    unsigned char *data = (unsigned char *)src->imageData;
-    int step = src->widthStep;
-    int i, j, k;
+image mat_to_image(Mat m)
+ {
+    int h = m.rows;
+    int w = m.cols;
+    int c = m.channels();
+     image im = make_image(w, h, c);
+    unsigned char *data = (unsigned char*)m.data;
+    int step = m.step;
+     int i, j, k;

     for(i = 0; i < h; ++i){
         for(k= 0; k < c; ++k){
@@ -42,26 +46,7 @@ image ipl_to_image(IplImage* src)
             }
         }
     }
-    return im;
-}
-
-Mat image_to_mat(image im)
-{
-    image copy = copy_image(im);
-    constrain_image(copy);
-    if(im.c == 3) rgbgr_image(copy);

-    IplImage *ipl = image_to_ipl(copy);
-    Mat m = cvarrToMat(ipl, true);
-    cvReleaseImage(&ipl);
-    free_image(copy);
-    return m;
-}
-
-image mat_to_image(Mat m)
-{
-    IplImage ipl = m;
-    image im = ipl_to_image(&ipl);
     rgbgr_image(im);
     return im;
 }
@@ -72,9 +57,9 @@ void *open_video_stream(const char *f, int c, int w, int h, int fps)
     if(f) cap = new VideoCapture(f);
     else cap = new VideoCapture(c);
     if(!cap->isOpened()) return 0;
-    if(w) cap->set(CV_CAP_PROP_FRAME_WIDTH, w);
-    if(h) cap->set(CV_CAP_PROP_FRAME_HEIGHT, w);
-    if(fps) cap->set(CV_CAP_PROP_FPS, w);
+    if(w) cap->set(CAP_PROP_FRAME_WIDTH, w);
+    if(h) cap->set(CAP_PROP_FRAME_HEIGHT, w);
+    if(fps) cap->set(CAP_PROP_FPS, w);
     return (void *) cap;
 }

@@ -123,7 +108,7 @@ void make_window(char *name, int w, int h, int fullscreen)
 {
     namedWindow(name, WINDOW_NORMAL);
     if (fullscreen) {
-        setWindowProperty(name, CV_WND_PROP_FULLSCREEN, CV_WINDOW_FULLSCREEN);
+        setWindowProperty(name, WND_PROP_FULLSCREEN, WINDOW_FULLSCREEN);
     } else {
         resizeWindow(name, w, h);
         if(strcmp(name, "Demo") == 0) moveWindow(name, 0, 0);