diff --git a/README2 b/README2
deleted file mode 100644
index 0cb6ed7..0000000
--- a/README2
+++ /dev/null
@@ -1 +0,0 @@
-www.1238090.com
\ No newline at end of file
diff --git a/opencv_gpb/Makefile b/opencv_gpb/Makefile
index 584244d..7b54778 100644
--- a/opencv_gpb/Makefile
+++ b/opencv_gpb/Makefile
@@ -1,7 +1,7 @@
 CC = g++
 CFLAGS = `pkg-config --cflags opencv` -I./include/gPb -I./include/sPb -I./include/seg
 
-LIBS = `pkg-config --libs opencv` -L/opt/local/lib -larpack -lparpack -L/opt/local/lib/gcc47 -lgfortran
+LIBS = `pkg-config --libs opencv` -L/opt/local/lib -larpack -lparpack
 
 SRC = 	src/main.cpp 		   \
 	src/gPb/globalPb.cpp       \
diff --git a/opencv_gpb/Makefile.osx b/opencv_gpb/Makefile.osx
new file mode 100644
index 0000000..467c85c
--- /dev/null
+++ b/opencv_gpb/Makefile.osx
@@ -0,0 +1,29 @@
+#Makefile for OS X, compiles and runs OK using g++ == clang++ on 10.9, with homebrew versions of opencv and arpack
+
+CC = g++
+
+CFLAGS = `pkg-config --cflags opencv` -I./include/gPb -I./include/sPb -I./include/seg
+
+LIBS = `pkg-config --libs opencv` -L/usr/local/lib -larpack
+
+SRC = 	src/main.cpp 		   \
+	src/gPb/globalPb.cpp       \
+	src/gPb/Filters.cpp        \
+	src/sPb/buildW.cpp         \
+	src/sPb/ic.cpp             \
+	src/sPb/affinity.cpp       \
+	src/sPb/smatrix.cpp        \
+	src/sPb/normCut.cpp        \
+	src/seg/watershed.cpp      \
+	src/seg/VisWatershed.cpp   \
+	src/seg/contour2ucm.cpp    \
+	src/seg/ucm_mean_pb.cpp    \
+	src/seg/uvt.cpp 
+
+OBJ = gPb
+
+program:
+	$(CC) -o $(OBJ) $(SRC) $(CFLAGS) $(LIBS)
+
+clean:
+	rm $(OBJ)
\ No newline at end of file
diff --git a/opencv_gpb/src/main.cpp b/opencv_gpb/src/main.cpp
index d845e1a..732fef8 100644
--- a/opencv_gpb/src/main.cpp
+++ b/opencv_gpb/src/main.cpp
@@ -51,6 +51,10 @@ void on_trackbar(int, void* )
 int main(int argc, char** argv) {
 
     //info block
+    if (argc < 2) {
+        cout<<"Give the name of an image file to analyse using gPb"<<endl;
+        return 0;
+    }
     system("clear");
     cout<<"(before running it, roughly mark the areas on the ucm window)"<<endl;
     cout<<"Press 'r' - resort the original ucm, and remark"<<endl;
diff --git a/opencv_gpb/src/sPb/affinity.cpp b/opencv_gpb/src/sPb/affinity.cpp
index a6a6be1..3d564b5 100644
--- a/opencv_gpb/src/sPb/affinity.cpp
+++ b/opencv_gpb/src/sPb/affinity.cpp
@@ -44,7 +44,7 @@ float C_IC_SS(float ic)
     val += (ic / 0.3130)*-1.3113;
 
     const float post = 1.0 / (1.0 + exp(-val));
-    if (!finite(post)) {
+    if (!isfinite(post)) {
         return 0;
     }
     if (post < 0) {
diff --git a/opencv_gpb/src/seg/VisWatershed.cpp b/opencv_gpb/src/seg/VisWatershed.cpp
index 1e8e228..e02e4dd 100644
--- a/opencv_gpb/src/seg/VisWatershed.cpp
+++ b/opencv_gpb/src/seg/VisWatershed.cpp
@@ -99,19 +99,19 @@ assert( 0 <= diff && diff <= 255 ); \
 
     if( CV_MAT_TYPE(src->type) != CV_8UC3 ) {
         printf("Only 8-bit, 3-channel input images are supported");
-        exit;
+        exit(EXIT_FAILURE);
     }
     //CV_ERROR( CV_StsUnsupportedFormat, "Only 8-bit, 3-channel input images are supported" );
 
     if( CV_MAT_TYPE(dst->type) != CV_32SC1 ) {
         printf("Only 32-bit, 1-channel output images are supported");
-        exit;
+        exit(EXIT_FAILURE);
     }
     //CV_ERROR( CV_StsUnsupportedFormat, "Only 32-bit, 1-channel output images are supported" );
 
     if( !CV_ARE_SIZES_EQ( src, dst )) {
         printf("The input and output images must have the same size");
-        exit;
+        exit(EXIT_FAILURE);
     }
     //CV_ERROR( CV_StsUnmatchedSizes, "The input and output images must have the same size" );
 
@@ -188,7 +188,7 @@ assert( 0 <= diff && diff <= 255 ); \
 
     // if there is no markers, exit immediately
     if( i == NQ )
-        exit;
+        exit(EXIT_FAILURE);
 
     active_queue = i;
     img = src->data.ptr;
@@ -224,17 +224,20 @@ assert( 0 <= diff && diff <= 255 ); \
         t = m[-1];
         if( t > 0 ) lab = t;
         t = m[1];
-        if( t > 0 )
+        if( t > 0 ) {
             if( lab == 0 ) lab = t;
             else if( t != lab ) lab = WSHED;
+        }
         t = m[-mstep];
-        if( t > 0 )
+        if( t > 0 ) {
             if( lab == 0 ) lab = t;
             else if( t != lab ) lab = WSHED;
+        }
         t = m[mstep];
-        if( t > 0 )
+        if( t > 0 ) {
             if( lab == 0 ) lab = t;
             else if( t != lab ) lab = WSHED;
+        }
 
         assert( lab != 0 );
         m[0] = lab;
diff --git a/opencv_gpb/src/seg/watershed.cpp b/opencv_gpb/src/seg/watershed.cpp
index b966719..b96bec1 100644
--- a/opencv_gpb/src/seg/watershed.cpp
+++ b/opencv_gpb/src/seg/watershed.cpp
@@ -141,8 +141,8 @@ watershedFull(const cv::Mat & image,
     //viscous forced watershed:
     //cv::viswatershed(image3, regions, 3, 0.015);
 
-    // OpenCV convention: -1 for boundaries, zone index start a 0
-    // Matlab convention: 0 for boundaries, zone index start a 1
+    // OpenCV convention: -1 for boundaries, zone index start at 0
+    // Matlab convention: 0 for boundaries, zone index start at 1
     regions = regions + 1;
 }
 }