diff -Nrup ht-2.0.16.orig/htapp.cc ht-2.0.16/htapp.cc
--- ht-2.0.16.orig/htapp.cc	2008-05-19 00:11:22.000000000 +0200
+++ ht-2.0.16/htapp.cc	2009-04-05 19:10:20.000000000 +0200
@@ -2962,7 +2962,7 @@ void ht_app::project_opencreate(const ch
 		LOG("%s: invalid filename", filename);
 		return;
 	}
-	char *suf = sys_filename_suffix(fn);
+	const char *suf = sys_filename_suffix(fn);
 	/* append HT project file suffix if not already there */
 	if (!(suf && (strcmp(suf, HT_PROJECT_CONFIG_SUFFIX+1)==0))) {
 		strcat(fn, HT_PROJECT_CONFIG_SUFFIX);
diff -Nrup ht-2.0.16.orig/htformat.cc ht-2.0.16/htformat.cc
--- ht-2.0.16.orig/htformat.cc	2008-07-10 01:09:36.000000000 +0200
+++ ht-2.0.16/htformat.cc	2009-04-05 19:14:08.000000000 +0200
@@ -3916,7 +3916,7 @@ void ht_uformat_viewer::update_misc_info
 void ht_uformat_viewer::update_visual_info()
 {
 	cursorline_get();
-	char *s, *t = cursor_line;
+	const char *s, *t = cursor_line;
 	int v = 0, vl = 0;
 	int i = 0, g = 0;
 	while ((s=tag_findnext(t))) {
diff -Nrup ht-2.0.16.orig/htreg.cc ht-2.0.16/htreg.cc
--- ht-2.0.16.orig/htreg.cc	2007-05-09 00:50:24.000000000 +0200
+++ ht-2.0.16/htreg.cc	2009-04-05 19:11:13.000000000 +0200
@@ -781,7 +781,7 @@ bool ht_registry::find_data_entry(const 
 ht_registry_node *ht_registry::find_entry_i(Container **rdir, const char *key, bool follow_symlinks)
 {
 	ht_registry_node *dir = root;
-	char *s;
+	const char *s;
 	char t[256]; /* FIXME: possible buffer overflow */
 	if (key[0]=='/') key++;
 	while (1) {
diff -Nrup ht-2.0.16.orig/httag.cc ht-2.0.16/httag.cc
--- ht-2.0.16.orig/httag.cc	2008-03-26 12:51:36.000000000 +0100
+++ ht-2.0.16/httag.cc	2009-04-05 19:12:33.000000000 +0200
@@ -537,7 +537,7 @@ void statictag_to_tag(const char *static
 	*tag_str = 0;
 }
 
-TAGSTRING *tag_findnext(const TAGSTRING *tagstring)
+const TAGSTRING *tag_findnext(const TAGSTRING *tagstring)
 {
 	return strchr(tagstring, '\e');
 }
diff -Nrup ht-2.0.16.orig/httag.h ht-2.0.16/httag.h
--- ht-2.0.16.orig/httag.h	2007-05-09 01:30:13.000000000 +0200
+++ ht-2.0.16/httag.h	2009-04-05 19:12:48.000000000 +0200
@@ -447,7 +447,7 @@ typedef char TAGSTRING;
 
 void statictag_to_tag(const char *statictag_str, TAGSTRING *tag_str, int maxlen, uint64 relocation, bool std_bigendian);
 
-TAGSTRING *tag_findnext(const TAGSTRING *tagstring);
+const TAGSTRING *tag_findnext(const TAGSTRING *tagstring);
 
 vcp tag_get_color(const TAGSTRING *tagstring);
 void tag_get_id(const TAGSTRING *tagstring, uint32 *id128_1, uint32 *id128_2, uint32 *id128_3, uint32 *id128_4);
diff -Nrup ht-2.0.16.orig/httext.cc ht-2.0.16/httext.cc
--- ht-2.0.16.orig/httext.cc	2007-05-09 00:50:24.000000000 +0200
+++ ht-2.0.16/httext.cc	2009-04-05 19:15:03.000000000 +0200
@@ -103,6 +103,7 @@ void ht_text_viewer2::handlemsg(htmsg *m
  */
 
 /* FIXME: put it somewhere else..., why ain't this a POSIX function ? */
+#if 0
 void *memrchr(const void *string, int ch, size_t num)
 {
 	while (num--) {
@@ -110,6 +111,7 @@ void *memrchr(const void *string, int ch
 	}
 	return NULL;
 }
+#endif
  
 
 #define TEXT_SUB_READSIZE		256
diff -Nrup ht-2.0.16.orig/info/infoview.cc ht-2.0.16/info/infoview.cc
--- ht-2.0.16.orig/info/infoview.cc	2007-12-04 21:27:15.000000000 +0100
+++ ht-2.0.16/info/infoview.cc	2009-04-05 19:07:09.000000000 +0200
@@ -193,7 +193,7 @@ Container *parse_info_node(File *fl, con
 		} else {
 fallback:
 			if (k && k > n) {
-				char *cr = strchr(n, '\n');
+				const char *cr = strchr(n, '\n');
 				if (cr && cr < k) k = cr;
 				if (k-n == 0) goto fallback2;
 				fl->write(n, k-n);
@@ -423,11 +423,11 @@ int ht_info_viewer::find_node(const char
 	const char *tags[] = {"File", "Node", "Prev", "Next", "Up"};
 #define NUM_NODE_TAGS (sizeof (tags) / sizeof (tags[0]))
 	const char *s = infotext;
-	char *firstnode = NULL;
+	const char *firstnode = NULL;
 	while ((s=strchr(s, 0x1f))) {
 		s++;
 		while ((*s>0) && (*s<32)) s++;
-		char *cr = strchr(s, '\n');
+		const char *cr = strchr(s, '\n');
 		if (cr) {
 			while (*s && (s<cr)) {
 				whitespaces(s);
@@ -437,7 +437,7 @@ int ht_info_viewer::find_node(const char
 					if (ht_strncmp(s, tags[i], l) == 0 && s[l] == ':') {
 						s += l+1;
 						whitespaces(s);
-						char *e = strchr(s, ',');
+						const char *e = strchr(s, ',');
 						if (!e || (e>cr)) e = cr;
 						if (!firstnode && (strcmp(tags[i], "Node") == 0)) {
 							firstnode = cr+1;
diff -Nrup ht-2.0.16.orig/io/file.cc ht-2.0.16/io/file.cc
--- ht-2.0.16.orig/io/file.cc	2008-03-05 16:52:27.000000000 +0100
+++ ht-2.0.16/io/file.cc	2009-04-05 19:09:21.000000000 +0200
@@ -210,9 +210,9 @@ static char *_env_replace(char *str, uns
 int sys_basename(char *result, const char *filename)
 {
 	// FIXME: use is_path_delim
-	char *slash1 = strrchr(filename, '/');
-	char *slash2 = strrchr(filename, '\\');
-	char *slash = (slash1 > slash2) ? slash1 : slash2;
+	const char *slash1 = strrchr(filename, '/');
+	const char *slash2 = strrchr(filename, '\\');
+	const char *slash = (slash1 > slash2) ? slash1 : slash2;
 	if (slash) {
 		int l = strlen(filename);
 		ht_strlcpy(result, slash+1, l-(slash-filename)+1);
@@ -395,14 +395,14 @@ int sys_common_canonicalize(char *result
 	return (k == 0) ? 0 : EINVAL;
 }
 
-char *sys_filename_suffix(const char *fn)
+const char *sys_filename_suffix(const char *fn)
 {
 	const char *s = NULL;
 	while (fn && *fn) {
 		if (sys_is_path_delim(*fn)) s = fn+1;
 		fn++;
 	}
-	char *p = s ? strrchr(s, '.') : NULL;
+	const char *p = s ? strrchr(s, '.') : NULL;
 	return p ? p+1 : NULL;
 }
 
diff -Nrup ht-2.0.16.orig/io/file.h ht-2.0.16/io/file.h
--- ht-2.0.16.orig/io/file.h	2007-12-04 21:27:15.000000000 +0100
+++ ht-2.0.16/io/file.h	2009-04-05 19:09:05.000000000 +0200
@@ -154,7 +154,7 @@ char *		sys_dirname(char *path);
 char * 		sys_get_home_dir();
 int		sys_relname(char *result, const char *filename, const char *cwd);
 int		sys_common_canonicalize(char *result, const char *in_name, const char *cwd, is_path_delim delim);
-char *		sys_filename_suffix(const char *fn);
+const char *	sys_filename_suffix(const char *fn);
 int		sys_tmpfile_fd();
 
 /* system-dependant (implementation in $MYSYSTEM/ *.cc) */