diff --git a/appl/ftp/config.h.in b/appl/ftp/config.h.in
index ef5fe7a55..ca2ce1b35 100644
--- a/appl/ftp/config.h.in
+++ b/appl/ftp/config.h.in
@@ -9,6 +9,9 @@
 /* Define if you have the gethostbyname function.  */
 #undef HAVE_GETHOSTBYNAME
 
+/* Define if you have the mmap function.  */
+#undef HAVE_MMAP
+
 /* Define if you have the setproctitle function.  */
 #undef HAVE_SETPROCTITLE
 
@@ -21,6 +24,9 @@
 /* Define if you have the <paths.h> header file.  */
 #undef HAVE_PATHS_H
 
+/* Define if you have the <sys/mman.h> header file.  */
+#undef HAVE_SYS_MMAN_H
+
 /* Define if you have the <sys/select.h> header file.  */
 #undef HAVE_SYS_SELECT_H
 
diff --git a/appl/ftp/configure b/appl/ftp/configure
index e00939afe..6d342cdad 100755
--- a/appl/ftp/configure
+++ b/appl/ftp/configure
@@ -872,7 +872,7 @@ else
 fi
  LD_FLAGS="$krb_cv_ld_flags"
    
-for ac_hdr in sys/select.h paths.h bsd/bsd.h
+for ac_hdr in sys/select.h paths.h bsd/bsd.h sys/mman.h
 do
 ac_safe=`echo "$ac_hdr" | tr './\055' '___'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
@@ -1067,7 +1067,7 @@ EOF
 esac
 
 
-for ac_func in setproctitle
+for ac_func in setproctitle mmap
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then