Index: ../trunk-jpl/externalpackages/petsc/install-3.1-win7.sh
===================================================================
--- ../trunk-jpl/externalpackages/petsc/install-3.1-win7.sh	(revision 16880)
+++ ../trunk-jpl/externalpackages/petsc/install-3.1-win7.sh	(revision 16881)
@@ -14,12 +14,13 @@
 rm -rf petsc-3.1-p7
 
 export PETSC_DIR=`cygpath -u "$ISSM_DIR/externalpackages/petsc/src"`
+export PREFIX_DIR=`cygpath -u "$ISSM_DIR/externalpackages/petsc/install"`
 
 #configure
 cd src
 ./config/configure.py  \
 	--with-parallel-no \
-	--prefix="$ISSM_DIR/externalpackages/petsc/install" \
+	--prefix=$PREFIX_DIR \
 	--PETSC_ARCH=cygwin-intel \
 	--PETSC_DIR=$PETSC_DIR \
 	--with-debugging=0 \