Index: /issm/trunk-jpl/externalpackages/petsc/install-3.1-win7.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/petsc/install-3.1-win7.sh	(revision 16880)
+++ /issm/trunk-jpl/externalpackages/petsc/install-3.1-win7.sh	(revision 16881)
@@ -15,4 +15,5 @@
 
 export PETSC_DIR=`cygpath -u "$ISSM_DIR/externalpackages/petsc/src"`
+export PREFIX_DIR=`cygpath -u "$ISSM_DIR/externalpackages/petsc/install"`
 
 #configure
@@ -20,5 +21,5 @@
 ./config/configure.py  \
 	--with-parallel-no \
-	--prefix="$ISSM_DIR/externalpackages/petsc/install" \
+	--prefix=$PREFIX_DIR \
 	--PETSC_ARCH=cygwin-intel \
 	--PETSC_DIR=$PETSC_DIR \