From a3977466db0aff6d1d82f3100745982d479bbff3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Thu, 22 May 2014 10:38:41 +0200
Subject: [PATCH] build: Fix builds without --with-libgcrypt-prefix nor
 --with-libgcrypt-libdir.

Reported by Manolis Ragkousis <manolis837@gmail.com>.
Fixes a regression introduced in 14af289.

Before this commit, ./configure would leave LIBGCRYPT_PREFIX and
LIBGCRYPT_LIBDIR undefined, leading to LIBGCRYPT_LIBS="-L -lgcrypt" and
thus to a link failure.

* configure.ac: Make sure $LIBGCRYPT_PREFIX and $LIBGCRYPT_LIBDIR are
  never empty.
---
 configure.ac | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 7b2a0e4dd5..d65211779c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -124,7 +124,9 @@ AC_ARG_WITH([libgcrypt-prefix],
       LIBGCRYPT_LIBDIR="$withval/lib"
       ;;
    esac],
-  [LIBGCRYPT="libgcrypt"])
+  [LIBGCRYPT="libgcrypt"
+   LIBGCRYPT_PREFIX="no"
+   LIBGCRYPT_LIBDIR="no"])
 
 AC_ARG_WITH([libgcrypt-libdir],
   [AS_HELP_STRING([--with-libgcrypt-libdir=DIR],
@@ -141,6 +143,9 @@ AC_ARG_WITH([libgcrypt-libdir],
    esac],
   [if test "x$LIBGCRYPT" = x; then
       LIBGCRYPT="libgcrypt"
+   fi
+   if test "x$LIBGCRYPT_LIBDIR" = x; then
+      LIBGCRYPT_LIBDIR="no"
    fi])
 
 dnl Library name suitable for `dynamic-link'.