diff --git a/app-doc/doxygen/files/doxygen-1.5.7.1-substitute.patch b/app-doc/doxygen/files/doxygen-1.5.7.1-substitute.patch
deleted file mode 100644
--- a/app-doc/doxygen/files/doxygen-1.5.7.1-substitute.patch
+++ /dev/null
@@ -1,24 +0,0 @@
---- doxygen-1.5.7.1-orig/src/util.cpp	2008-10-04 14:28:00.000000000 +0200
-+++ doxygen-1.5.7.1/src/util.cpp	2008-12-18 20:55:15.000000000 +0100
-@@ -4447,10 +4447,10 @@
- 
- QCString substitute(const char *s,const char *src,const char *dst)
- {
--  if (s==0 || src==0 || dst==0) return s;
-+  if (s==0 || src==0) return s;
-   const char *p, *q;
-   int srcLen = strlen(src);
--  int dstLen = strlen(dst);
-+  int dstLen = dst ? strlen(dst) : 0;
-   int resLen;
-   if (srcLen!=dstLen)
-   {
-@@ -4469,7 +4469,7 @@
-     int l = (int)(q-p);
-     memcpy(r,p,l);
-     r+=l;
--    memcpy(r,dst,dstLen);
-+    if (dst) memcpy(r,dst,dstLen);
-     r+=dstLen;
-   }
-   strcpy(r,p);