diff --git a/helper.c b/helper.c
index c9aa51e4f..6959535d2 100644
--- a/helper.c
+++ b/helper.c
@@ -45,18 +45,15 @@
 
 #include "rc4.h"
 #include "xmalloc.h"
-
+#include "config.h"
 #include "helper.h"
 
+#ifndef HAVE_ARC4RANDOM
+
 void get_random_bytes(unsigned char *buf, int len);
 
 static rc4_t *rc4 = NULL;
 
-void setproctitle(const char *fmt, ...)
-{
-	/* FIXME */
-}
-
 unsigned int arc4random(void)
 {
 	unsigned int r;
@@ -105,4 +102,11 @@ void get_random_bytes(unsigned char *buf, int len)
 		exit(1);
 	}
 }
+#endif /* !HAVE_ARC4RANDOM */
 
+#ifndef HAVE_SETPROCTITLE
+void setproctitle(const char *fmt, ...)
+{
+	/* FIXME */
+}
+#endif /* !HAVE_SETPROCTITLE */
diff --git a/helper.h b/helper.h
index 309156a2c..0e53fac43 100644
--- a/helper.h
+++ b/helper.h
@@ -36,8 +36,15 @@
 #ifndef _HELPER_H
 #define _HELPER_H
 
+#include "config.h"
+
+#ifndef HAVE_ARC4RANDOM
 unsigned int arc4random(void);
 void arc4random_stir(void);
+#endif /* !HAVE_ARC4RANDOM */
+
+#ifndef HAVE_SETPROCTITLE
 void setproctitle(const char *fmt, ...);
+#endif /* !HAVE_SETPROCTITLE */
 
 #endif /* _HELPER_H */
diff --git a/mktemp.c b/mktemp.c
index 69dc4dc6f..de11a6b53 100644
--- a/mktemp.c
+++ b/mktemp.c
@@ -47,8 +47,11 @@ static char rcsid[] = "$OpenBSD: mktemp.c,v 1.13 1998/06/30 23:03:13 deraadt Exp
 #include <ctype.h>
 #include <unistd.h>
 
+#include "config.h"
 #include "helper.h"
 
+#ifndef HAVE_MKDTEMP
+
 static int _gettemp __P((char *, int *, int, int));
 
 int
@@ -181,3 +184,5 @@ _gettemp(path, doopen, domkdir, slen)
 	}
 	/*NOTREACHED*/
 }
+
+#endif /* !HAVE_MKDTEMP */
diff --git a/mktemp.h b/mktemp.h
index 5d380058e..ac92cbae0 100644
--- a/mktemp.h
+++ b/mktemp.h
@@ -1,7 +1,11 @@
 #ifndef _MKTEMP_H
 #define _MKTEMP_H
+
+#include "config.h"
+#ifndef HAVE_MKDTEMP
 int mkstemps(char *path, int slen);
 int mkstemp(char *path);
 char *mkdtemp(char *path);
+#endif /* !HAVE_MKDTEMP */
 
 #endif /* _MKTEMP_H */
diff --git a/rc4.c b/rc4.c
index a426188aa..998a10774 100644
--- a/rc4.c
+++ b/rc4.c
@@ -41,6 +41,9 @@
 
 /* $Id: rc4.c,v 1.1.1.1 1999/10/26 05:48:13 damien Exp $ */
 
+#include "config.h"
+
+#ifndef HAVE_ARC4RANDOM
 #include "rc4.h"
 
 
@@ -103,3 +106,4 @@ void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len)
 		c++;
 	}
 }
+#endif /* !HAVE_ARC4RANDOM */
diff --git a/rc4.h b/rc4.h
index 904affec3..1be64acac 100644
--- a/rc4.h
+++ b/rc4.h
@@ -44,6 +44,9 @@
 #ifndef _RC4_H
 #define _RC4_H
 
+#include "config.h"
+#ifndef HAVE_ARC4RANDOM
+
 /*! \struct rc4_t
     \brief RC4 stream cipher state object
 	 \var s State array
@@ -107,4 +110,6 @@ void rc4_crypt(rc4_t *r, unsigned char *plaintext, int len);
 */
 void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len);
 
+#endif /* !HAVE_ARC4RANDOM */
+
 #endif /* _RC4_H */
diff --git a/strlcpy.c b/strlcpy.c
index 300a28bc3..4df4080d6 100644
--- a/strlcpy.c
+++ b/strlcpy.c
@@ -34,6 +34,9 @@ static char *rcsid = "$OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp
 #include <sys/types.h>
 #include <string.h>
 
+#include "config.h"
+#ifndef HAVE_STRLCPY
+
 /*
  * Copy src to string dst of size siz.  At most siz-1 characters
  * will be copied.  Always NUL terminates (unless siz == 0).
@@ -66,3 +69,5 @@ size_t strlcpy(dst, src, siz)
 
 	return(s - src - 1);	/* count does not include NUL */
 }
+
+#endif /* !HAVE_STRLCPY */
diff --git a/strlcpy.h b/strlcpy.h
index 824df300c..9afbd39c5 100644
--- a/strlcpy.h
+++ b/strlcpy.h
@@ -1,4 +1,9 @@
 #ifndef _STRLCPY_H
 #define _STRLCPY_H
+
+#include "config.h"
+#ifndef HAVE_STRLCPY
 size_t strlcpy(char *dst, const char *src, size_t siz);
+#endif /* !HAVE_STRLCPY */
+
 #endif /* _STRLCPY_H */