diff --git a/slirp/misc.c b/slirp/misc.c
index 2fbd04856a..1a0ea1be4e 100644
--- a/slirp/misc.c
+++ b/slirp/misc.c
@@ -60,27 +60,6 @@ int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
 	return 0;
 }
 
-#ifndef HAVE_STRERROR
-
-/*
- * For systems with no strerror
- */
-
-extern int sys_nerr;
-extern char *sys_errlist[];
-
-char *
-strerror(error)
-	int error;
-{
-	if (error < sys_nerr)
-	   return sys_errlist[error];
-	else
-	   return "Unknown error.";
-}
-
-#endif
-
 
 #ifdef _WIN32
 
diff --git a/slirp/slirp.h b/slirp/slirp.h
index 203deec480..5b5df59762 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -23,11 +23,6 @@ typedef char *caddr_t;
 # include <sys/bitypes.h>
 #endif
 
-
-#ifndef HAVE_MEMMOVE
-#define memmove(x, y, z) bcopy(y, x, z)
-#endif
-
 #ifndef _WIN32
 #include <sys/uio.h>
 #endif
@@ -37,17 +32,6 @@ typedef char *caddr_t;
 #include <arpa/inet.h>
 #endif
 
-/* Systems lacking strdup() definition in <string.h>. */
-#if defined(ultrix)
-char *strdup(const char *);
-#endif
-
-/* Systems lacking malloc() definition in <stdlib.h>. */
-#if defined(ultrix) || defined(hcx)
-void *malloc(size_t arg);
-void free(void *ptr);
-#endif
-
 #ifndef NO_UNIX_SOCKETS
 #include <sys/un.h>
 #endif
@@ -259,18 +243,6 @@ void if_start(Slirp *);
 void if_start(struct ttys *);
 #endif
 
-#ifndef HAVE_STRERROR
- char *strerror(int error);
-#endif
-
-#ifndef HAVE_INDEX
- char *index(const char *, int);
-#endif
-
-#ifndef HAVE_GETHOSTID
- long gethostid(void);
-#endif
-
 #ifndef _WIN32
 #include <netdb.h>
 #endif
diff --git a/slirp/slirp_config.h b/slirp/slirp_config.h
index a5fa36e16f..c59f655207 100644
--- a/slirp/slirp_config.h
+++ b/slirp/slirp_config.h
@@ -34,9 +34,6 @@
 #define HAVE_SYS_FILIO_H
 #endif
 
-/* Define if you have strerror */
-#define HAVE_STRERROR
-
 /* Define if you have sys/bitypes.h */
 #undef HAVE_SYS_BITYPES_H
 
@@ -82,15 +79,6 @@
 #define HAVE_INET_ATON
 #endif
 
-/* Define if you have index() */
-#define HAVE_INDEX
-
-/* Define if you have memmove */
-#define HAVE_MEMMOVE
-
-/* Define if you have gethostid */
-#define HAVE_GETHOSTID
-
 /* Define if you DON'T have unix-domain sockets */
 #undef NO_UNIX_SOCKETS
 #ifdef _WIN32