diff --git a/appl/kx/common.c b/appl/kx/common.c
index d597c0781..d5df63ce5 100644
--- a/appl/kx/common.c
+++ b/appl/kx/common.c
@@ -7,7 +7,7 @@ do_enccopy (int fd1, int fd2, int mode, des_cblock *iv,
 	    des_key_schedule schedule, int *num)
 {
      int ret;
-     char buf[BUFSIZ];
+     u_char buf[BUFSIZ];
 
      ret = read (fd1, buf, sizeof(buf));
      if (ret == 0)
@@ -74,7 +74,7 @@ copy_encrypted (int fd1, int fd2, des_cblock *iv,
  */
 
 RETSIGTYPE
-childhandler ()
+childhandler (int sig)
 {
   pid_t pid;
   int status;
diff --git a/appl/kx/kx.h b/appl/kx/kx.h
index 41b4d65ee..d7a5737f6 100644
--- a/appl/kx/kx.h
+++ b/appl/kx/kx.h
@@ -16,6 +16,9 @@
 #ifdef HAVE_SYS_RESOURCE_H
 #include <sys/resource.h>
 #endif
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
 #include <sys/wait.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
@@ -38,7 +41,7 @@ extern char *prog;
 int copy_encrypted (int fd1, int fd2, des_cblock *iv,
 		    des_key_schedule schedule);
 
-RETSIGTYPE childhandler ();
+RETSIGTYPE childhandler (int);
 
 int get_local_xsocket (unsigned dnr);
 int connect_local_xsocket (unsigned dnr);