diff --git a/compat.h b/compat.h
index 720cd909..f33dcf1a 100644
--- a/compat.h
+++ b/compat.h
@@ -289,6 +289,11 @@ void		 explicit_bzero(void *, size_t);
 int		 getdtablecount(void);
 #endif
 
+#ifndef HAVE_GETDTABLESIZE
+/* getdtablesize.c */
+int		 getdtablesize(void);
+#endif
+
 #ifndef HAVE_CLOSEFROM
 /* closefrom.c */
 void		 closefrom(int);
diff --git a/compat/htonll.c b/compat/htonll.c
index aef65983..86f34b46 100644
--- a/compat/htonll.c
+++ b/compat/htonll.c
@@ -14,6 +14,7 @@
  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <arpa/inet.h>
 #include <sys/types.h>
 
 #include "compat.h"
diff --git a/compat/ntohll.c b/compat/ntohll.c
index c2fe1bb7..b1f77ca7 100644
--- a/compat/ntohll.c
+++ b/compat/ntohll.c
@@ -14,6 +14,7 @@
  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <arpa/inet.h>
 #include <sys/types.h>
 
 #include "compat.h"
diff --git a/compat/setproctitle.c b/compat/setproctitle.c
index e72ae274..99fad55c 100644
--- a/compat/setproctitle.c
+++ b/compat/setproctitle.c
@@ -17,6 +17,7 @@
 #include <sys/types.h>
 
 #include <stdarg.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include "compat.h"