diff --git a/api/renderer.cpp b/api/renderer.cpp
index b55f846bec..85ff1338d9 100644
--- a/api/renderer.cpp
+++ b/api/renderer.cpp
@@ -8,6 +8,10 @@
 #include "genericvector.h"
 #include "renderer.h"
 
+#if !defined(VERSION)
+#include "version.h"
+#endif
+
 namespace tesseract {
 
 // Start with a 4K output buffer which should be pretty big for a page of text
diff --git a/ccstruct/coutln.cpp b/ccstruct/coutln.cpp
index a13238d929..90be0c823d 100644
--- a/ccstruct/coutln.cpp
+++ b/ccstruct/coutln.cpp
@@ -657,10 +657,10 @@ static void ComputeGradient(const l_uint32* data, int wpl,
                             int x, int y, int width, int height,
                             ICOORD* gradient) {
   const l_uint32* line = data + y * wpl;
-  int pix_x_y = x < width && y < height ? GET_DATA_BYTE(line, x) : 255;
-  int pix_x_prevy = x < width && y > 0 ? GET_DATA_BYTE(line - wpl, x) : 255;
-  int pix_prevx_prevy = x > 0 && y > 0 ? GET_DATA_BYTE(line - wpl, x - 1) : 255;
-  int pix_prevx_y = x > 0 && y < height ? GET_DATA_BYTE(line, x - 1) : 255;
+  int pix_x_y = x < width && y < height ? GET_DATA_BYTE((void *)line, x) : 255;
+  int pix_x_prevy = x < width && y > 0 ? GET_DATA_BYTE((void *)(line - wpl), x) : 255;
+  int pix_prevx_prevy = x > 0 && y > 0 ? GET_DATA_BYTE((void *)(line - wpl), x - 1) : 255;
+  int pix_prevx_y = x > 0 && y < height ? GET_DATA_BYTE((void *)line, x - 1) : 255;
   gradient->set_x(pix_x_y + pix_x_prevy - (pix_prevx_y + pix_prevx_prevy));
   gradient->set_y(pix_x_prevy + pix_prevx_prevy - (pix_x_y + pix_prevx_y));
 }
@@ -674,8 +674,8 @@ static bool EvaluateVerticalDiff(const l_uint32* data, int wpl, int diff_sign,
   if (y <= 0 || y >= height)
     return false;
   const l_uint32* line = data + y * wpl;
-  int pixel1 = GET_DATA_BYTE(line - wpl, x);
-  int pixel2 = GET_DATA_BYTE(line, x);
+  int pixel1 = GET_DATA_BYTE((void *)(line - wpl), x);
+  int pixel2 = GET_DATA_BYTE((void *)line, x);
   int diff = (pixel2 - pixel1) * diff_sign;
   if (diff > *best_diff) {
     *best_diff = diff;
@@ -693,8 +693,8 @@ static bool EvaluateHorizontalDiff(const l_uint32* line, int diff_sign,
                                    int* best_diff, int* best_sum, int* best_x) {
   if (x <= 0 || x >= width)
     return false;
-  int pixel1 = GET_DATA_BYTE(line, x - 1);
-  int pixel2 = GET_DATA_BYTE(line, x);
+  int pixel1 = GET_DATA_BYTE((void *)line, x - 1);
+  int pixel2 = GET_DATA_BYTE((void *)line, x);
   int diff = (pixel2 - pixel1) * diff_sign;
   if (diff > *best_diff) {
     *best_diff = diff;
diff --git a/ccstruct/points.cpp b/ccstruct/points.cpp
index c0a9922f11..6569fba417 100644
--- a/ccstruct/points.cpp
+++ b/ccstruct/points.cpp
@@ -17,6 +17,10 @@
  *
  **********************************************************************/
 
+#ifdef _MSC_VER
+#define _USE_MATH_DEFINES
+#endif  // _MSC_VER
+
 #include          <stdlib.h>
 #include          "helpers.h"
 #include          "ndminx.h"
diff --git a/ccutil/genericvector.h b/ccutil/genericvector.h
index c1b2f059b1..3122549564 100644
--- a/ccutil/genericvector.h
+++ b/ccutil/genericvector.h
@@ -877,6 +877,10 @@ int GenericVector<T>::choose_nth_item(int target_index, int start, int end,
     }
   }
   // Place the pivot at start.
+  #ifdef _MSC_VER  // TODO(zdenop): check this
+  srand( (unsigned) seed );
+  #define rand_r(seed) rand()
+  #endif  // _MSC_VER
   int pivot = rand_r(seed) % num_elements + start;
   swap(pivot, start);
   // The invariant condition here is that items [start, next_lesser) are less
diff --git a/textord/baselinedetect.cpp b/textord/baselinedetect.cpp
index b5feb5e45b..4c9e977798 100644
--- a/textord/baselinedetect.cpp
+++ b/textord/baselinedetect.cpp
@@ -17,6 +17,10 @@
 //
 ///////////////////////////////////////////////////////////////////////
 
+#ifdef _MSC_VER
+#define _USE_MATH_DEFINES
+#endif  // _MSC_VER
+
 #include "baselinedetect.h"
 
 #include <math.h>
diff --git a/textord/bbgrid.h b/textord/bbgrid.h
index d2e7710988..8b81ebb74d 100644
--- a/textord/bbgrid.h
+++ b/textord/bbgrid.h
@@ -30,19 +30,23 @@
 // you don't get this functionality.
 #ifdef HAVE_CONFIG_H
 #include "config_auto.h"
-#endif
+#endif  // HAVE_CONFIG_H
 #ifdef USE_STD_NAMESPACE
-#ifdef __linux__
+#if (defined(__GNUC__) && (((__GNUC__ == 3) && ( __GNUC_MINOR__ > 0)) || __GNUC__ >= 4))  // gcc
 // hash_set is deprecated in gcc
 #include <ext/hash_set>
 using __gnu_cxx::hash_set;
 #else
 #include <hash_set>
+#ifdef _MSC_VER
+using namespace stdext;
+#else
 using std::hash_set;
-#endif
+#endif  // _MSC_VER
+#endif // gcc
 #else
 #include <hash_set>
-#endif
+#endif  // USE_STD_NAMESPACE
 #include "allheaders.h"
 
 class BLOCK;
diff --git a/vs2008/port/version.h b/vs2008/port/version.h
index 52e9b78bdb..b1bdf4ceb0 100644
--- a/vs2008/port/version.h
+++ b/vs2008/port/version.h
@@ -20,6 +20,6 @@
 #ifndef           VS2008_PORT_VERSION_H_
 #define           VS2008_PORT_VERSION_H_
 
-#define VERSION "3.02.03"
+#define VERSION "3.03"
 
 #endif  // VS2008_PORT_VERSION_H_
diff --git a/wordrec/language_model.cpp b/wordrec/language_model.cpp
index 83f7e64710..2f430a0e55 100644
--- a/wordrec/language_model.cpp
+++ b/wordrec/language_model.cpp
@@ -32,6 +32,12 @@
 #include "params.h"
 #include "params_training_featdef.h"
 
+#ifdef _MSC_VER
+double log2(double n) {
+	return log(n) / log(double(2));
+}
+#endif  // _MSC_VER
+
 namespace tesseract {
 
 const float LanguageModel::kMaxAvgNgramCost = 25.0f;