diff --git a/auto/src/glew_head.c b/auto/src/glew_head.c
index 9f0a009..e945bcd 100644
--- a/auto/src/glew_head.c
+++ b/auto/src/glew_head.c
@@ -211,7 +211,7 @@ static GLboolean _glewStrSame (const GLubyte* a, const GLubyte* b, GLuint n)
   return i == n ? GL_TRUE : GL_FALSE;
 }
 
-static GLboolean _glewStrSame1 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
+static GLboolean _glewStrSame1 (const GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
 {
   while (*na > 0 && (**a == ' ' || **a == '\n' || **a == '\r' || **a == '\t'))
   {
@@ -232,7 +232,7 @@ static GLboolean _glewStrSame1 (GLubyte** a, GLuint* na, const GLubyte* b, GLuin
   return GL_FALSE;
 }
 
-static GLboolean _glewStrSame2 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
+static GLboolean _glewStrSame2 (const GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
 {
   if(*na >= nb)
   {
@@ -248,7 +248,7 @@ static GLboolean _glewStrSame2 (GLubyte** a, GLuint* na, const GLubyte* b, GLuin
   return GL_FALSE;
 }
 
-static GLboolean _glewStrSame3 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
+static GLboolean _glewStrSame3 (const GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
 {
   if(*na >= nb)
   {
diff --git a/auto/src/glew_str_glx.c b/auto/src/glew_str_glx.c
index 1db8d3a..e841475 100644
--- a/auto/src/glew_str_glx.c
+++ b/auto/src/glew_str_glx.c
@@ -12,7 +12,7 @@ GLboolean glxewContextIsSupported (const GLXEWContext* ctx, const char* name)
 GLboolean glxewIsSupported (const char* name)
 #endif
 {
-  GLubyte* pos = (GLubyte*)name;
+  const GLubyte* pos = (const GLubyte*)name;
   GLuint len = _glewStrLen(pos);
   GLboolean ret = GL_TRUE;
   while (ret && len > 0)
diff --git a/auto/src/glew_str_head.c b/auto/src/glew_str_head.c
index ebeb48d..1e8d963 100644
--- a/auto/src/glew_str_head.c
+++ b/auto/src/glew_str_head.c
@@ -4,7 +4,7 @@ GLboolean GLEWAPIENTRY glewContextIsSupported (const GLEWContext* ctx, const cha
 GLboolean GLEWAPIENTRY glewIsSupported (const char* name)
 #endif
 {
-  GLubyte* pos = (GLubyte*)name;
+  const GLubyte* pos = (const GLubyte*)name;
   GLuint len = _glewStrLen(pos);
   GLboolean ret = GL_TRUE;
   while (ret && len > 0)
diff --git a/auto/src/glew_str_wgl.c b/auto/src/glew_str_wgl.c
index 20552bd..5463ef7 100644
--- a/auto/src/glew_str_wgl.c
+++ b/auto/src/glew_str_wgl.c
@@ -12,7 +12,7 @@ GLboolean GLEWAPIENTRY wglewContextIsSupported (const WGLEWContext* ctx, const c
 GLboolean GLEWAPIENTRY wglewIsSupported (const char* name)
 #endif
 {
-  GLubyte* pos = (GLubyte*)name;
+  const GLubyte* pos = (const GLubyte*)name;
   GLuint len = _glewStrLen(pos);
   GLboolean ret = GL_TRUE;
   while (ret && len > 0)
diff --git a/config/Makefile.linux b/config/Makefile.linux
index b460b4b..55e4a23 100644
--- a/config/Makefile.linux
+++ b/config/Makefile.linux
@@ -23,6 +23,7 @@ NAME = GLEW
 WARN = -Wall -W
 POPT = -O2
 CFLAGS.EXTRA += -fPIC
+CFLAGS.EXTRA += -Wcast-qual
 BIN.SUFFIX =
 LIB.SONAME = lib$(NAME).so.$(SO_MAJOR)
 LIB.DEVLNK = lib$(NAME).so