commit 6b9efdde7828b3317b64f38bd90fb5a784a654c0
author Christian Brabandt <cb@256bit.org> Thu Sep 09 17:14:50 2021 +0200
committer Bram Moolenaar <Bram@vim.org> Thu Sep 09 17:14:50 2021 +0200
tree ad79a11d3cd6a743b93f638bdea1972ac874717d
parent 0325d3967ce7d0fd35bc1472fd476b911b895b76

patch 8.2.3420: _REENTRANT defined more than once

Problem:    _REENTRANT defined more than once.
Solution:   Fix configure script. (Christian Brabandt, closes #8852)

src/configure.ac

diff --git a/src/configure.ac b/src/configure.ac
index 4cd6dea..d417b90 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -3756,7 +3756,9 @@
   AC_MSG_CHECKING(for libcanberra)
   ac_save_CFLAGS="$CFLAGS"
   ac_save_LIBS="$LIBS"
-  CFLAGS="$CFLAGS $canberra_cflags"
+  if `echo "$CFLAGS" | grep -v "$canberra_cflags" >/dev/null`; then
+    CFLAGS="$CFLAGS $canberra_cflags"
+  fi
   LIBS="$LIBS $canberra_lib"
   AC_TRY_LINK([
   # include <canberra.h>