diff --git a/lib/roken/roken.h b/lib/roken/roken.h
index 0c51ca306..4cfdead9d 100644
--- a/lib/roken/roken.h
+++ b/lib/roken/roken.h
@@ -3,4 +3,46 @@
 #ifndef __ROKEN_H__
 #define __ROKEN_H__
 
+#ifndef HAVE_PUTENV
+int putenv(const char *string)
+#endif
+
+#ifndef HAVE_SETENV
+int setenv(const char *var, const char *val, int rewrite);
+#endif
+
+#ifndef HAVE_GETUSERSHELL
+char *getusershell __P((void));
+#endif
+
+#ifndef HAVE_STRDUP
+char * strdup(const char *old);
+#endif
+
+#ifndef HAVE_GETDTABLESIZE
+int getdtablesize(void);
+#endif
+
+#ifdef RETSIGTYPE
+typedef RETSIGTYPE (*SigAction)(/* int??? */);
+SigAction signal(int iSig, SigAction pAction); /* BSD compatible */
+#endif
+
+#ifndef HAVE_SNPRINTF
+int snprintf(char *s, int n, const char *fmt, ...);
+#endif
+
+#ifndef HAVE_STRERROR
+char *strerror(int eno);
+#endif
+
+#ifndef HAVE_HSTRERROR
+char *hstrerror(int herr);
+#endif
+
+#ifndef HAVE_INET_ATON
+/* Minimal implementation of inet_aton. Doesn't handle hex numbers. */
+int inet_aton(char *cp, struct in_addr *adr);
+#endif
+
 #endif /*  __ROKEN_H__ */
diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index 0c51ca306..4cfdead9d 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -3,4 +3,46 @@
 #ifndef __ROKEN_H__
 #define __ROKEN_H__
 
+#ifndef HAVE_PUTENV
+int putenv(const char *string)
+#endif
+
+#ifndef HAVE_SETENV
+int setenv(const char *var, const char *val, int rewrite);
+#endif
+
+#ifndef HAVE_GETUSERSHELL
+char *getusershell __P((void));
+#endif
+
+#ifndef HAVE_STRDUP
+char * strdup(const char *old);
+#endif
+
+#ifndef HAVE_GETDTABLESIZE
+int getdtablesize(void);
+#endif
+
+#ifdef RETSIGTYPE
+typedef RETSIGTYPE (*SigAction)(/* int??? */);
+SigAction signal(int iSig, SigAction pAction); /* BSD compatible */
+#endif
+
+#ifndef HAVE_SNPRINTF
+int snprintf(char *s, int n, const char *fmt, ...);
+#endif
+
+#ifndef HAVE_STRERROR
+char *strerror(int eno);
+#endif
+
+#ifndef HAVE_HSTRERROR
+char *hstrerror(int herr);
+#endif
+
+#ifndef HAVE_INET_ATON
+/* Minimal implementation of inet_aton. Doesn't handle hex numbers. */
+int inet_aton(char *cp, struct in_addr *adr);
+#endif
+
 #endif /*  __ROKEN_H__ */
diff --git a/lib/roken/snprintf.c b/lib/roken/snprintf.c
index 9d35de6b4..99344facf 100644
--- a/lib/roken/snprintf.c
+++ b/lib/roken/snprintf.c
@@ -7,7 +7,7 @@
 
 RCSID("$Id$");
 
-int snprintf(char *s, int n, char *fmt, ...)
+int snprintf(char *s, int n, const char *fmt, ...)
 {
   int ret;
   va_list ap;