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[PATCH 2/3] configure: add option to specify grep

Allows users for which GNU grep is not the default grep (e.g. BSD
folks), or is in a weird location.

Reported-by: Fabian Freyer <fabian.freyer@physik.tu-berlin.de>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Fabian Freyer <fabian.freyer@physik.tu-berlin.de>
---
 configure.ac | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/configure.ac b/configure.ac
index f8c67be..9899a3b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -94,6 +94,11 @@ AC_ARG_WITH([install],
                    [Specify the full PATH to a BSD-compatible install]),
     [INSTALL=$withval])
 AC_PROG_INSTALL
+AC_CACHE_VAL([ac_cv_path_GREP],
+    [AC_ARG_WITH([grep],
+        AS_HELP_STRING([--with-grep=PATH],
+                       [Specify the full PATH to GNU grep]),
+        [ac_cv_path_GREP=$withval])])
 AC_PROG_GREP
 AC_PROG_EGREP
 AS_IF(
-- 
1.9.1


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