diff -ur ctags-5.8.orig/c.c ctags-5.8/c.c
--- ctags-5.8.orig/c.c	2023-01-29 21:39:39.092029264 +0100
+++ ctags-5.8/c.c	2023-01-29 21:56:25.586429350 +0100
@@ -619,7 +619,7 @@
 	return name;
 }
 
-static void __unused__ pt (tokenInfo *const token)
+static void ctags_attr_unused pt (tokenInfo *const token)
 {
 	if (isType (token, TOKEN_NAME))
 		printf ("type: %-12s: %-13s   line: %lu\n",
@@ -634,7 +634,7 @@
 			tokenString (token->type), token->lineNumber);
 }
 
-static void __unused__ ps (statementInfo *const st)
+static void ctags_attr_unused ps (statementInfo *const st)
 {
 	unsigned int i;
 	printf ("scope: %s   decl: %s   gotName: %s   gotParenName: %s\n",
diff -ur ctags-5.8.orig/debug.h ctags-5.8/debug.h
--- ctags-5.8.orig/debug.h	2007-06-24 21:57:09.000000000 +0200
+++ ctags-5.8/debug.h	2023-01-29 21:54:58.442301695 +0100
@@ -58,7 +58,7 @@
 *   Function prototypes
 */
 extern void lineBreak (void);
-extern void debugPrintf (const enum eDebugLevels level, const char *const format, ...) __printf__ (2, 3);
+extern void debugPrintf (const enum eDebugLevels level, const char *const format, ...) ctags_attr_printf (2, 3);
 extern void debugPutc (const int level, const int c);
 extern void debugParseNest (const boolean increase, const unsigned int level);
 extern void debugCppNest (const boolean begin, const unsigned int level);
diff -ur ctags-5.8.orig/eiffel.c ctags-5.8/eiffel.c
--- ctags-5.8.orig/eiffel.c	2023-01-29 21:39:39.095362496 +0100
+++ ctags-5.8/eiffel.c	2023-01-29 21:56:12.003492590 +0100
@@ -807,7 +807,7 @@
 
 static boolean parseType (tokenInfo *const token);
 
-static void parseGeneric (tokenInfo *const token, boolean declaration __unused__)
+static void parseGeneric (tokenInfo *const token, boolean declaration ctags_attr_unused)
 {
 	unsigned int depth = 0;
 #ifdef TYPE_REFERENCE_TOOL
diff -ur ctags-5.8.orig/general.h ctags-5.8/general.h
--- ctags-5.8.orig/general.h	2007-05-03 05:21:08.000000000 +0200
+++ ctags-5.8/general.h	2023-01-29 21:54:14.060256268 +0100
@@ -57,11 +57,11 @@
  *  to prevent warnings about unused variables.
  */
 #if (__GNUC__ > 2  ||  (__GNUC__ == 2  &&  __GNUC_MINOR__ >= 7)) && !defined (__GNUG__)
-# define __unused__  __attribute__((unused))
-# define __printf__(s,f)  __attribute__((format (printf, s, f)))
+# define ctags_attr_unused  __attribute__((unused))
+# define ctags_attr_printf(s,f)  __attribute__((format (printf, s, f)))
 #else
-# define __unused__
-# define __printf__(s,f)
+# define ctags_attr_unused
+# define ctags_attr_printf(s,f)
 #endif
 
 /*
diff -ur ctags-5.8.orig/lregex.c ctags-5.8/lregex.c
--- ctags-5.8.orig/lregex.c	2023-01-29 21:39:39.082029568 +0100
+++ ctags-5.8/lregex.c	2023-01-29 21:56:52.985628533 +0100
@@ -538,11 +538,11 @@
 #endif  /* HAVE_REGEX */
 
 extern void addTagRegex (
-		const langType language __unused__,
-		const char* const regex __unused__,
-		const char* const name __unused__,
-		const char* const kinds __unused__,
-		const char* const flags __unused__)
+		const langType language ctags_attr_unused,
+		const char* const regex ctags_attr_unused,
+		const char* const name ctags_attr_unused,
+		const char* const kinds ctags_attr_unused,
+		const char* const flags ctags_attr_unused)
 {
 #ifdef HAVE_REGEX
 	Assert (regex != NULL);
@@ -564,10 +564,10 @@
 }
 
 extern void addCallbackRegex (
-		const langType language __unused__,
-		const char* const regex __unused__,
-		const char* const flags __unused__,
-		const regexCallback callback __unused__)
+		const langType language ctags_attr_unused,
+		const char* const regex ctags_attr_unused,
+		const char* const flags ctags_attr_unused,
+		const regexCallback callback ctags_attr_unused)
 {
 #ifdef HAVE_REGEX
 	Assert (regex != NULL);
@@ -581,7 +581,7 @@
 }
 
 extern void addLanguageRegex (
-		const langType language __unused__, const char* const regex __unused__)
+		const langType language ctags_attr_unused, const char* const regex ctags_attr_unused)
 {
 #ifdef HAVE_REGEX
 	if (! regexBroken)
@@ -602,7 +602,7 @@
 */
 
 extern boolean processRegexOption (const char *const option,
-								   const char *const parameter __unused__)
+								   const char *const parameter ctags_attr_unused)
 {
 	boolean handled = FALSE;
 	const char* const dash = strchr (option, '-');
@@ -624,7 +624,7 @@
 	return handled;
 }
 
-extern void disableRegexKinds (const langType language __unused__)
+extern void disableRegexKinds (const langType language ctags_attr_unused)
 {
 #ifdef HAVE_REGEX
 	if (language <= SetUpper  &&  Sets [language].count > 0)
@@ -639,8 +639,8 @@
 }
 
 extern boolean enableRegexKind (
-		const langType language __unused__,
-		const int kind __unused__, const boolean mode __unused__)
+		const langType language ctags_attr_unused,
+		const int kind ctags_attr_unused, const boolean mode ctags_attr_unused)
 {
 	boolean result = FALSE;
 #ifdef HAVE_REGEX
@@ -660,7 +660,7 @@
 	return result;
 }
 
-extern void printRegexKinds (const langType language __unused__, boolean indent __unused__)
+extern void printRegexKinds (const langType language ctags_attr_unused, boolean indent ctags_attr_unused)
 {
 #ifdef HAVE_REGEX
 	if (language <= SetUpper  &&  Sets [language].count > 0)
diff -ur ctags-5.8.orig/lua.c ctags-5.8/lua.c
--- ctags-5.8.orig/lua.c	2006-10-12 05:26:40.000000000 +0200
+++ ctags-5.8/lua.c	2023-01-29 21:56:09.113576927 +0100
@@ -37,7 +37,7 @@
 */
 
 /* for debugging purposes */
-static void __unused__ print_string (char *p, char *q)
+static void ctags_attr_unused print_string (char *p, char *q)
 {
 	for ( ; p != q; p++)
 		fprintf (errout, "%c", *p);
diff -ur ctags-5.8.orig/main.c ctags-5.8/main.c
--- ctags-5.8.orig/main.c	2007-06-07 06:35:21.000000000 +0200
+++ ctags-5.8/main.c	2023-01-29 21:56:29.099660063 +0100
@@ -522,7 +522,7 @@
  *		Start up code
  */
 
-extern int main (int __unused__ argc, char **argv)
+extern int main (int ctags_attr_unused argc, char **argv)
 {
 	cookedArgs *args;
 #ifdef VMS
diff -ur ctags-5.8.orig/options.c ctags-5.8/options.c
--- ctags-5.8.orig/options.c	2007-09-05 04:00:44.000000000 +0200
+++ ctags-5.8/options.c	2023-01-29 21:55:59.927178263 +0100
@@ -730,7 +730,7 @@
 }
 
 static void processExcludeOption (
-		const char *const option __unused__, const char *const parameter)
+		const char *const option ctags_attr_unused, const char *const parameter)
 {
 	const char *const fileName = parameter + 1;
 	if (parameter [0] == '\0')
@@ -867,7 +867,7 @@
 }
 
 static void processFilterTerminatorOption (
-		const char *const option __unused__, const char *const parameter)
+		const char *const option ctags_attr_unused, const char *const parameter)
 {
 	freeString (&Option.filterTerminator);
 	Option.filterTerminator = stringCopy (parameter);
@@ -930,8 +930,8 @@
 }
 
 static void processHelpOption (
-		const char *const option __unused__,
-		const char *const parameter __unused__)
+		const char *const option ctags_attr_unused,
+		const char *const parameter ctags_attr_unused)
 {
 	printProgramIdentification ();
 	putchar ('\n');
@@ -1139,8 +1139,8 @@
 }
 
 static void processLicenseOption (
-		const char *const option __unused__,
-		const char *const parameter __unused__)
+		const char *const option ctags_attr_unused,
+		const char *const parameter ctags_attr_unused)
 {
 	printProgramIdentification ();
 	puts ("");
@@ -1166,8 +1166,8 @@
 }
 
 static void processListMapsOption (
-		const char *const __unused__ option,
-		const char *const __unused__ parameter)
+		const char *const ctags_attr_unused option,
+		const char *const ctags_attr_unused parameter)
 {
 	if (parameter [0] == '\0' || strcasecmp (parameter, "all") == 0)
 	    printLanguageMaps (LANG_AUTO);
@@ -1183,8 +1183,8 @@
 }
 
 static void processListLanguagesOption (
-		const char *const option __unused__,
-		const char *const parameter __unused__)
+		const char *const option ctags_attr_unused,
+		const char *const parameter ctags_attr_unused)
 {
 	printLanguageList ();
 	exit (0);
@@ -1358,8 +1358,8 @@
 }
 
 static void processVersionOption (
-		const char *const option __unused__,
-		const char *const parameter __unused__)
+		const char *const option ctags_attr_unused,
+		const char *const parameter ctags_attr_unused)
 {
 	printProgramIdentification ();
 	exit (0);
diff -ur ctags-5.8.orig/options.h ctags-5.8/options.h
--- ctags-5.8.orig/options.h	2007-09-05 04:00:44.000000000 +0200
+++ ctags-5.8/options.h	2023-01-29 21:55:10.711944997 +0100
@@ -122,7 +122,7 @@
 /*
 *   FUNCTION PROTOTYPES
 */
-extern void verbose (const char *const format, ...) __printf__ (1, 2);
+extern void verbose (const char *const format, ...) ctags_attr_printf (1, 2);
 extern void freeList (stringList** const pString);
 extern void setDefaultTagFileName (void);
 extern void checkOptions (void);
diff -ur ctags-5.8.orig/parse.c ctags-5.8/parse.c
--- ctags-5.8.orig/parse.c	2007-07-31 07:35:33.000000000 +0200
+++ ctags-5.8/parse.c	2023-01-29 21:56:18.749962319 +0100
@@ -376,7 +376,7 @@
 */
 
 extern void processLanguageDefineOption (
-		const char *const option, const char *const parameter __unused__)
+		const char *const option, const char *const parameter ctags_attr_unused)
 {
 #ifdef HAVE_REGEX
 	if (parameter [0] == '\0')
diff -ur ctags-5.8.orig/routines.c ctags-5.8/routines.c
--- ctags-5.8.orig/routines.c	2023-01-29 21:39:39.068696639 +0100
+++ ctags-5.8/routines.c	2023-01-29 21:56:04.163721350 +0100
@@ -526,7 +526,7 @@
 
 #if ! defined (HAVE_STAT_ST_INO)
 
-static void canonicalizePath (char *const path __unused__)
+static void canonicalizePath (char *const path ctags_attr_unused)
 {
 #if defined (MSDOS_STYLE_PATH)
 	char *p;
diff -ur ctags-5.8.orig/routines.h ctags-5.8/routines.h
--- ctags-5.8.orig/routines.h	2007-06-07 06:35:21.000000000 +0200
+++ ctags-5.8/routines.h	2023-01-29 21:55:18.851708213 +0100
@@ -85,7 +85,7 @@
 extern void setExecutableName (const char *const path);
 extern const char *getExecutableName (void);
 extern const char *getExecutablePath (void);
-extern void error (const errorSelection selection, const char *const format, ...) __printf__ (2, 3);
+extern void error (const errorSelection selection, const char *const format, ...) ctags_attr_printf (2, 3);
 
 /* Memory allocation functions */
 #ifdef NEED_PROTO_MALLOC