diff --git a/configure.ac b/configure.ac
index 32a162f1..7e473eaf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -102,7 +102,7 @@ AC_TYPE_GETGROUPS
 AC_FUNC_UTIME_NULL
 AC_REPLACE_FUNCS(mkdir putgrent putpwent putspent rename rmdir)
 AC_REPLACE_FUNCS(sgetgrent sgetpwent sgetspent)
-AC_REPLACE_FUNCS(snprintf strcasecmp strdup strerror strstr)
+AC_REPLACE_FUNCS(snprintf strcasecmp strdup strstr)
 
 AC_CHECK_FUNC(setpgrp)
 AC_CHECK_FUNC(secure_getenv, [AC_DEFINE(HAS_SECURE_GETENV,
diff --git a/lib/defines.h b/lib/defines.h
index 74162f47..311bd7c4 100644
--- a/lib/defines.h
+++ b/lib/defines.h
@@ -250,7 +250,6 @@ static inline void memzero(void *ptr, size_t size)
 #ifdef sun			/* hacks for compiling on SunOS */
 # ifndef SOLARIS
 extern char *strdup ();
-extern char *strerror ();
 # endif
 #endif