A user complained on the gcc-help list that download_prerequisites
wasn't working for him, because he ran it from the wrong directory.

Tested on x86_64-pc-linux-gnu.
OK for trunk and active branches?

        * download_prerequisites: Make sure that script is run from
        top level source directory.

diff --git a/contrib/download_prerequisites b/contrib/download_prerequisites
index de0e7c41847d..95fab9aecfe1 100755
--- a/contrib/download_prerequisites
+++ b/contrib/download_prerequisites
@@ -24,6 +24,11 @@
 # be downloaded.
 GRAPHITE_LOOP_OPT=yes
 
+if [ ! -e gcc/BASE-VER ] ; then
+       echo "You must run this script in the top level GCC source directory."
+       exit 1
+fi
+
 # Necessary to build GCC.
 MPFR=mpfr-2.4.2
 GMP=gmp-4.3.2

-- 
Markus

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