diff --git a/auto/bin/filter_gl_ext.sh b/auto/bin/filter_gl_ext.sh
index 210f1ca..b45dde0 100755
--- a/auto/bin/filter_gl_ext.sh
+++ b/auto/bin/filter_gl_ext.sh
@@ -313,19 +313,19 @@ EOT
 # add typedef to GL_AMD_debug_output
 # parse_spec.pl can't parse typedefs from New Types section, but ought to
     cat >> $1/GL_AMD_debug_output <<EOT
-	typedef void (APIENTRY *GLDEBUGPROCAMD)(GLuint id, GLenum category, GLenum severity, GLsizei length, const GLchar* message, void* userParam)
+	typedef void (GLAPIENTRY *GLDEBUGPROCAMD)(GLuint id, GLenum category, GLenum severity, GLsizei length, const GLchar* message, void* userParam)
 EOT
 
 # add typedef to GL_ARB_debug_output
 # parse_spec.pl can't parse typedefs from New Types section, but ought to
     cat >> $1/GL_ARB_debug_output <<EOT
-	typedef void (APIENTRY *GLDEBUGPROCARB)(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* userParam)
+	typedef void (GLAPIENTRY *GLDEBUGPROCARB)(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* userParam)
 EOT
 
 # add typedef to GL_KHR_debug
 # parse_spec.pl can't parse typedefs from New Types section, but ought to
     cat >> $1/GL_KHR_debug <<EOT
-	typedef void (APIENTRY *GLDEBUGPROC)(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* userParam)
+	typedef void (GLAPIENTRY *GLDEBUGPROC)(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* userParam)
 EOT
 
 # Remove glGetPointerv from GL_KHR_debug
diff --git a/auto/src/glew_head.h b/auto/src/glew_head.h
index 49012f0..a033399 100644
--- a/auto/src/glew_head.h
+++ b/auto/src/glew_head.h
@@ -38,13 +38,24 @@
  * GL needs GLAPI and GLAPIENTRY, GLU needs APIENTRY, CALLBACK, and wchar_t
  * defined properly.
  */
-/* <windef.h> */
-#ifndef APIENTRY
+/* <windef.h> and <gl.h>*/
+#ifdef APIENTRY
+#  ifndef GLAPIENTRY
+#    define GLAPIENTRY APIENTRY
+#  endif
+#  ifndef GLEWAPIENTRY
+#    define GLEWAPIENTRY APIENTRY
+#  endif
+#else
 #define GLEW_APIENTRY_DEFINED
-#  if defined(__MINGW32__) || defined(__CYGWIN__)
-#    define APIENTRY __stdcall
-#  elif (_MSC_VER >= 800) || defined(_STDCALL_SUPPORTED) || defined(__BORLANDC__)
+#  if defined(__MINGW32__) || defined(__CYGWIN__) || (_MSC_VER >= 800) || defined(_STDCALL_SUPPORTED) || defined(__BORLANDC__)
 #    define APIENTRY __stdcall
+#    ifndef GLAPIENTRY
+#      define GLAPIENTRY __stdcall
+#    endif
+#    ifndef GLEWAPIENTRY
+#      define GLEWAPIENTRY __stdcall
+#    endif
 #  else
 #    define APIENTRY
 #  endif
@@ -101,14 +112,6 @@ typedef _W64 int ptrdiff_t;
 #  endif
 #endif
 
-#ifndef GLAPIENTRY
-#define GLAPIENTRY APIENTRY
-#endif
-
-#ifndef GLEWAPIENTRY
-#define GLEWAPIENTRY APIENTRY
-#endif
-
 /*
  * GLEW_STATIC is defined for static library.
  * GLEW_BUILD  is defined for building the DLL library.
@@ -170,6 +173,8 @@ typedef _W64 int ptrdiff_t;
 #define GLAPI extern
 #endif
 
+#endif /* _WIN32 */
+
 #ifndef GLAPIENTRY
 #define GLAPIENTRY
 #endif
@@ -178,8 +183,6 @@ typedef _W64 int ptrdiff_t;
 #define GLEWAPIENTRY
 #endif
 
-#endif /* _WIN32 */
-
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/auto/src/glew_tail.h b/auto/src/glew_tail.h
index 54023e3..bd9be0a 100644
--- a/auto/src/glew_tail.h
+++ b/auto/src/glew_tail.h
@@ -54,8 +54,6 @@ GLEWAPI const GLubyte * GLEWAPIENTRY glewGetString (GLenum name);
 #ifdef GLEW_APIENTRY_DEFINED
 #undef GLEW_APIENTRY_DEFINED
 #undef APIENTRY
-#undef GLAPIENTRY
-#define GLAPIENTRY
 #endif
 
 #ifdef GLEW_CALLBACK_DEFINED
diff --git a/doc/build.html b/doc/build.html
index de4689e..738a97e 100644
--- a/doc/build.html
+++ b/doc/build.html
@@ -144,6 +144,7 @@ width="88" height="32" border="0" alt="Support This Project"></a></td></tr> -->
 </ul>
 
 Ubuntu: <pre>sudo apt-get install libXmu-dev libXi-dev libgl-dev dos2unix</pre>
+Fedora: <pre>sudo yum install libXmu-devel libXi-devel libGL-devel dos2unix</pre>
 <!-- begin footer.html -->
 </td></tr></table></body>
 <!-- end footer.html -->