Adapted from https://sources.debian.net/data/main/d/doc%2B%2B/3.4.10-3.4/debian/patches/segfault_fix.patch

--- doc++-3.4.10/src/McDArray.h	2000-07-30 12:40:48.000000000 +0200
+++ doc++-3.4.10/src/McDArray.h	2005-05-10 15:02:06.000000000 +0200
@@ -80,9 +80,14 @@
     McDArray(const McDArray& old) : memFactor(old.memFactor),
 	thesize(old.thesize), themax(old.themax)
 	{
-	data = (T*)malloc(themax * sizeof(T));
-	if(thesize)
-	    memcpy(data, old.data, thesize * sizeof(T));
+	if (themax)
+	    {
+	    data = (T*)malloc(themax * sizeof(T));
+	    if(thesize)
+		memcpy(data, old.data, thesize * sizeof(T));
+	    }
+	else
+	    data = 0;
 	assert(isConsistent());
 	}
 
--- doc++-3.4.10/src/McDirectory.cc	2000-03-14 22:17:36.000000000 +0100
+++ doc++-3.4.10/src/McDirectory.cc	2005-05-10 15:02:18.000000000 +0200
@@ -23,12 +23,13 @@
 */
 
 #include "McDirectory.h"
-#include "McSorter.h"
 #include "McString.h"
 #include "doc.h"
 
 #include <stdio.h>
 
+#include <algorithm>
+
 #ifdef WIN32
 #include <windows.h>
 #ifdef __BORLANDC__
@@ -62,7 +63,7 @@
     FindClose(searchHandle);
     StringCompare comp;
     if(list.size())
-	sort((char **)list, list.size(), comp, 0);
+	std::sort((char **)list, (char **)list + list.size(), comp);
     return 0;
 }
 
@@ -107,7 +108,7 @@
     closedir(dir);
     StringCompare comp;
     if(list.size())
-	sort((char **)list, list.size(), comp, 0);
+	std::sort((char **)list, (char **)list + list.size(), comp);
     return list.size();
 }
 
--- doc++-3.4.10/src/McDirectory.h	2000-06-28 21:54:58.000000000 +0200
+++ doc++-3.4.10/src/McDirectory.h	2005-05-10 15:02:18.000000000 +0200
@@ -59,9 +59,9 @@
     class StringCompare
 	{
 	public:
-	    int operator()(const char *t1, const char *t2)
+	    bool operator()(const char *t1, const char *t2)
 		{
-		return strcmp(t1, t2);
+		return strcmp(t1, t2) < 0;
 		}
 	};
 };
--- doc++-3.4.10/src/html.cc	2001-02-17 07:34:49.000000000 +0100
+++ doc++-3.4.10/src/html.cc	2005-05-10 15:02:18.000000000 +0200
@@ -38,9 +38,10 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 
+#include <algorithm>
+
 #include "McDirectory.h"
 #include "McHashTable.h"
-#include "McSorter.h"
 #include "classgraph.h"
 #include "doc.h"
 #include "gifs.h"
@@ -314,9 +315,11 @@
 	virtual void writeMember(Entry *e, bool links, bool withSub = true);
 	class EntryCompare {
 	    public:
-		int operator()(const MemberWriterListEntry& l1, const MemberWriterListEntry& l2)
+		bool operator()(const MemberWriterListEntry& l1, const MemberWriterListEntry& l2)
 		    {
-		    return strcmp(l1.entry->fullName.c_str(), l2.entry->fullName.c_str());
+		    const char *s1 = l1.entry->fullName.c_str();
+		    const char *s2 = l2.entry->fullName.c_str();
+		    return strcmp(s1, s2) < 0;
 		    }
 	};
     public:
@@ -324,7 +327,7 @@
 	    {
 	    EntryCompare comp;
 	    if(list.size())
-		::sort((MemberWriterListEntry *)list, list.size(), comp, 0);
+		std::sort((MemberWriterListEntry *)list, (MemberWriterListEntry *)list + list.size(), comp);
 	    }
 	virtual void startList(FILE *f, char *heading, bool withLinks);
 	virtual void addMember(Entry *e, bool links, bool withSub = true)
@@ -376,7 +379,7 @@
 	    int lp;
 
 	    if(list.size() > 1)
-		::sort((TOCListEntry *)list, list.size(), comp, 0);
+		std::sort((TOCListEntry *)list, (TOCListEntry *)list + list.size(), comp);
 
 	    // Sort subsections
 	    for(lp = 0; lp < list.size(); lp++)
@@ -385,9 +388,9 @@
 	    }
 	class EntryCompare {
 	    public:
-		int operator()(TOCListEntry& l1, TOCListEntry& l2)
+		bool operator()(const TOCListEntry& l1, const TOCListEntry& l2)
 		    {
-		    return strcmp(l1.name, l2.name);
+		    return strcmp(l1.name, l2.name) < 0;
 		    }
 	};
 	void addEntry(Entry *entry, TOClist *tl);
@@ -487,7 +490,7 @@
 
     for(i = 0; i < list.size(); i++)
 	if(list[i].tl)
-	    free(list[i].tl);
+	    delete list[i].tl;
 }
 
 class HIERlist;
@@ -509,7 +512,7 @@
 	    int i;
 
 	    if(list.size() > 1)
-		::sort((HIERListEntry *)list, list.size(), comp, 0);
+		std::sort((HIERListEntry *)list, (HIERListEntry *)list + list.size(), comp);
 
 	    // Sort subentries
 	    for(i = 0; i < list.size(); i++)
@@ -519,9 +522,9 @@
 	class EntryCompare
 	    {
 	    public:
-		int operator()(HIERListEntry& l1, HIERListEntry& l2)
+		bool operator()(const HIERListEntry& l1, const HIERListEntry& l2)
 		    {
-		    return strcmp(l1.name, l2.name);
+		    return strcmp(l1.name, l2.name) < 0;
 		    }
 	    };
 	void addEntry(Entry *entry, HIERlist *hl);
--- doc++-3.4.10/src/readfiles.ll	2001-11-25 18:04:48.000000000 +0100
+++ doc++-3.4.10/src/readfiles.ll	2005-05-10 15:02:18.000000000 +0200
@@ -28,7 +28,6 @@
 #include <sys/types.h>
 
 #include "McDirectory.h"
-#include "McSorter.h"
 #include "McString.h"
 #include "doc.h"
 #include "nametable.h"
><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2018-02-24 20:01:30 +0300'>2018-02-24</span></td><td><a href='/guix/commit/gnu/packages/license.scm?id=82e5e0dd52aac659a57bf07ae55e86cd531ea099'>gnu: Add perl-software-license.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/license.scm (perl-software-license): New public variable.
</span></span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2018-02-24 20:01:29 +0300'>2018-02-24</span></td><td><a href='/guix/commit/gnu/packages/license.scm?id=f4e2d9ee6cf49ae7a9ff9a084517c274ea791955'>gnu: Add perl-string-copyright.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/license.scm (perl-string-copyright): New public variable.
</span></span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2018-02-24 20:01:29 +0300'>2018-02-24</span></td><td><a href='/guix/commit/gnu/packages/license.scm?id=d5ee4342c0e62124a6efeb7da4c53c1f69c51d1e'>gnu: Add perl-regexp-pattern-license.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/license.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add this.
</span></span></td><td>Oleg Pykhalov</td></tr>