diff --git a/auto/src/glew_gl.c b/auto/src/glew_gl.c
index 846b834..83a9a4e 100644
--- a/auto/src/glew_gl.c
+++ b/auto/src/glew_gl.c
@@ -36,7 +36,7 @@ GLboolean glewGetExtension (const GLubyte *name)
 {    
   GLubyte *p, *end;
   GLuint len = _glewStrLen(name);
-  p = glGetString(GL_EXTENSIONS);
+  p = (GLubyte*)glGetString(GL_EXTENSIONS);
   if (0 == p) return GL_FALSE;
   end = p + _glewStrLen(p);
   while (p < end)
@@ -52,7 +52,7 @@ GLboolean glewGetExtension (const GLubyte *name)
 
 static GLuint _glewInit ()
 {
-  GLubyte* s;
+  const GLubyte* s;
   GLuint i;
   /* query opengl version */
   s = glGetString(GL_VERSION);
diff --git a/auto/src/glewinfo_pre.c b/auto/src/glewinfo_pre.c
index eafdd04..1c38049 100644
--- a/auto/src/glewinfo_pre.c
+++ b/auto/src/glewinfo_pre.c
@@ -42,9 +42,9 @@ static void glewPrintExt (const GLubyte* name, GLboolean defined)
 {
   unsigned int i;
   fprintf(f, "\n%s:", name);
-  for (i=0; i<62-strlen(name); i++) fprintf(f, " ");
+  for (i=0; i<62-strlen((const char*)name); i++) fprintf(f, " ");
   fprintf(f, "%s\n", defined ? "OK" : "MISSING");
-  for (i=0; i<strlen(name)+1; i++) fprintf(f, "-");
+  for (i=0; i<strlen((const char*)name)+1; i++) fprintf(f, "-");
   fprintf(f, "\n");
   fflush(f);
 }
@@ -53,7 +53,7 @@ static void glewInfoFunc (const GLubyte* name, GLboolean undefined)
 {
   unsigned int i;
   fprintf(f, "  %s:", name);
-  for (i=0; i<60-strlen(name); i++) fprintf(f, " ");
+  for (i=0; i<60-strlen((const char*)name); i++) fprintf(f, " ");
   fprintf(f, "%s\n", undefined ? "MISSING" : "OK");
   fflush(f);
 }