X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fdup2.m4;h=62e31a88d5fbb757848fabe2a5a6a65557565f40;hb=265346b009e92de11efa737012ec86babe1048ba;hp=b8794c27b0426b218123207b388609e6eacb81ec;hpb=4a2a66e4454be259d3c6c29a34e625dc1b70bd7f;p=gnulib.git

diff --git a/m4/dup2.m4 b/m4/dup2.m4
index b8794c27b..62e31a88d 100644
--- a/m4/dup2.m4
+++ b/m4/dup2.m4
@@ -69,6 +69,7 @@ AC_DEFUN([gl_FUNC_DUP2],
 AC_DEFUN([gl_REPLACE_DUP2],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([dup2])
   if test $ac_cv_func_dup2 = yes; then
     REPLACE_DUP2=1
   fi