diff --git a/appl/ftp/configure.in b/appl/ftp/configure.in
index 1b7b4d9e2..9f647c9c3 100644
--- a/appl/ftp/configure.in
+++ b/appl/ftp/configure.in
@@ -27,11 +27,11 @@ AC_SUBST(CFLAGS) dnl
 AC_SUBST(LDFLAGS) dnl
 AC_SUBST(LD_FLAGS) dnl
 
-AC_CHECK_HEADERS(sys/select.h paths.h bsd/bsd.h)
+AC_CHECK_HEADERS(sys/select.h paths.h bsd/bsd.h sys/mman.h)
 
 AC_FIND_FUNC(socket, socket)
 AC_FIND_FUNC(gethostbyname, nsl)
 
-AC_CHECK_FUNCS(setproctitle)
+AC_CHECK_FUNCS(setproctitle mmap)
 
 AC_OUTPUT(Makefile common/Makefile ftp/Makefile ftpd/Makefile)