NEWS.stable: log cherry-pick [79aac72]->[cc1a9b7] canonicalize-lgpl: use common idiom

[gnulib.git] / m4 / dup2.m4

diff --git a/m4/dup2.m4 b/m4/dup2.m4
index b8794c2..62e31a8 100644 (file)
--- 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