Index: /issm/trunk-jpl/externalpackages/gsl/README
===================================================================
--- /issm/trunk-jpl/externalpackages/gsl/README	(revision 11747)
+++ /issm/trunk-jpl/externalpackages/gsl/README	(revision 11747)
@@ -0,0 +1,1 @@
+GNU Scientfic Library, obtained from: http://www.gnu.org/software/gsl/
Index: /issm/trunk-jpl/externalpackages/gsl/install-macosx64.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/gsl/install-macosx64.sh	(revision 11747)
+++ /issm/trunk-jpl/externalpackages/gsl/install-macosx64.sh	(revision 11747)
@@ -0,0 +1,28 @@
+#!/bin/bash
+
+#Some cleanup
+rm -rf src install gsl-1.15
+mkdir src install
+
+#Untar 
+tar -zxvf  gsl-1.15.tar.gz
+
+#Move gsl into src directory
+mv gsl-1.15/* src
+rm -rf gsl-1.15
+
+#Configure gsl
+cd src
+
+export CFLAGS=" -arch x86_64"
+
+./configure \
+	--prefix="$ISSM_TIER/externalpackages/gsl/install" 
+
+#Compile gsl
+if [ -z $1 ]; then
+	make
+else
+	make -j $1
+fi
+make install