diff --git a/extern/ttconv/global_defines.h b/extern/ttconv/global_defines.h
deleted file mode 100644
index 04dd41e02ac1..000000000000
--- a/extern/ttconv/global_defines.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/* -*- mode: c; c-basic-offset: 4 -*- */
-
-/*
- * Modified for use within matplotlib
- * 5 July 2007
- * Michael Droettboom
- */
-
-/*
-** ~ppr/src/include/global_defines.h
-** Copyright 1995, Trinity College Computing Center.
-** Written by David Chappell.
-**
-** Permission to use, copy, modify, and distribute this software and its
-** documentation for any purpose and without fee is hereby granted, provided
-** that the above copyright notice appear in all copies and that both that
-** copyright notice and this permission notice appear in supporting
-** documentation.  This software and documentation are provided "as is" without
-** express or implied warranty.
-**
-** The PPR project was begun 28 December 1992.
-**
-** There are many things in this file you may want to change.  This file
-** should be the first include file.  It is the header file for the whole
-** project.
-**
-** This file was last modified 22 December 1995.
-*/
-
-/*
-** TRUE and FALSE
-**  The code makes liberal use of these macros.
-*/
-#if !defined(FALSE)
-#define FALSE 0
-#endif
-#if !defined(TRUE)
-#define TRUE !FALSE
-#endif
-
-/* end of file */
diff --git a/extern/ttconv/pprdrv_tt.cpp b/extern/ttconv/pprdrv_tt.cpp
index c0837a7d9d30..934215470808 100644
--- a/extern/ttconv/pprdrv_tt.cpp
+++ b/extern/ttconv/pprdrv_tt.cpp
@@ -24,7 +24,6 @@
 ** Last revised 19 December 1995.
 */
 
-#include "global_defines.h"
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
@@ -130,7 +129,7 @@ BYTE *GetTable(struct TTFONT *font, const char *name)
     /* We must search the table directory. */
     ptr = font->offset_table + 12;
     x=0;
-    while (TRUE)
+    while (true)
     {
         if ( strncmp((const char*)ptr,name,4) == 0 )
         {
@@ -559,7 +558,7 @@ void ttfont_FontInfo(TTStreamWriter& stream, struct TTFONT *font)
 -------------------------------------------------------------------*/
 int string_len;
 int line_len;
-int in_string;
+bool in_string;
 
 /*
 ** This is called once at the start.
@@ -567,7 +566,7 @@ int in_string;
 void sfnts_start(TTStreamWriter& stream)
 {
     stream.puts("/sfnts[<");
-    in_string=TRUE;
+    in_string=true;
     string_len=0;
     line_len=8;
 } /* end of sfnts_start() */
@@ -584,7 +583,7 @@ void sfnts_pputBYTE(TTStreamWriter& stream, BYTE n)
         stream.put_char('<');
         string_len=0;
         line_len++;
-        in_string=TRUE;
+        in_string=true;
     }
 
     stream.put_char( hexdigits[ n / 16 ] );
@@ -650,7 +649,7 @@ void sfnts_end_string(TTStreamWriter& stream)
         stream.put_char('>');
         line_len++;
     }
-    in_string=FALSE;
+    in_string=false;
 } /* end of sfnts_end_string() */
 
 /*
diff --git a/extern/ttconv/pprdrv_tt2.cpp b/extern/ttconv/pprdrv_tt2.cpp
index 2643afa09930..058bc005348b 100644
--- a/extern/ttconv/pprdrv_tt2.cpp
+++ b/extern/ttconv/pprdrv_tt2.cpp
@@ -32,7 +32,6 @@
 ** Last revised 11 July 1995.
 */
 
-#include "global_defines.h"
 #include <cstdlib>
 #include <cmath>
 #include <cstring>
diff --git a/extern/ttconv/ttutil.cpp b/extern/ttconv/ttutil.cpp
index 13aa170e0f2f..85e7e23c4f07 100644
--- a/extern/ttconv/ttutil.cpp
+++ b/extern/ttconv/ttutil.cpp
@@ -9,7 +9,6 @@
 /* Very simple interface to the ppr TT routines */
 /* (c) Frank Siegert 1996 */
 
-#include "global_defines.h"
 #include <cstdio>
 #include <cstdarg>
 #include <cstdlib>