diff --git a/lib/roken/roken.h b/lib/roken/roken.h
index c473fca8f..7df5c98e6 100644
--- a/lib/roken/roken.h
+++ b/lib/roken/roken.h
@@ -51,6 +51,9 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_SYS_UIO_H
+#include <sys/uio.h>
+#endif
 #ifdef HAVE_GRP_H
 #include <grp.h>
 #endif
@@ -75,6 +78,10 @@
 #include <fcntl.h>
 #endif
 
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
 #ifdef HAVE_TERMIOS_H
 #include <termios.h>
 #endif
@@ -236,6 +243,16 @@ int rcmd(char **ahost, unsigned short inport, const char *locuser,
 	 const char *remuser, const char *cmd, int *fd2p);
 #endif
 
+#ifndef HAVE_WRITEV
+ssize_t
+writev(int d, const struct iovec *iov, int iovcnt);
+#endif
+
+#ifndef HAVE_READV
+ssize_t
+readv(int d, const struct iovec *iov, int iovcnt)
+#endif
+
 #ifndef HAVE_FLOCK
 #ifndef LOCK_SH
 #define LOCK_SH   1		/* Shared lock */
diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index c473fca8f..7df5c98e6 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -51,6 +51,9 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_SYS_UIO_H
+#include <sys/uio.h>
+#endif
 #ifdef HAVE_GRP_H
 #include <grp.h>
 #endif
@@ -75,6 +78,10 @@
 #include <fcntl.h>
 #endif
 
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
 #ifdef HAVE_TERMIOS_H
 #include <termios.h>
 #endif
@@ -236,6 +243,16 @@ int rcmd(char **ahost, unsigned short inport, const char *locuser,
 	 const char *remuser, const char *cmd, int *fd2p);
 #endif
 
+#ifndef HAVE_WRITEV
+ssize_t
+writev(int d, const struct iovec *iov, int iovcnt);
+#endif
+
+#ifndef HAVE_READV
+ssize_t
+readv(int d, const struct iovec *iov, int iovcnt)
+#endif
+
 #ifndef HAVE_FLOCK
 #ifndef LOCK_SH
 #define LOCK_SH   1		/* Shared lock */