X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/a4837536e2ef918dacf687c134e690cbbe693487..89bd9d36859503e25b767f97395870190f272bc1:/m4/putenv.m4

diff --git a/m4/putenv.m4 b/m4/putenv.m4
index 9de53527a7..03ed4f97db 100644
--- a/m4/putenv.m4
+++ b/m4/putenv.m4
@@ -48,3 +48,9 @@ AC_DEFUN([gl_FUNC_PUTENV],
       ;;
   esac
 ])
+
+# Prerequisites of lib/putenv.c.
+AC_DEFUN([gl_PREREQ_PUTENV],
+[
+  AC_CHECK_FUNCS([_putenv])
+])