Index: /issm/trunk-jpl/externalpackages/petsc/install-3.20-pleiades.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/petsc/install-3.20-pleiades.sh	(revision 27982)
+++ /issm/trunk-jpl/externalpackages/petsc/install-3.20-pleiades.sh	(revision 27982)
@@ -0,0 +1,56 @@
+#!/bin/bash
+set -eu
+
+
+## Constants
+#
+VER="3.20.1"
+
+PETSC_DIR="${ISSM_DIR}/externalpackages/petsc/src" # DO NOT CHANGE THIS
+PREFIX="${ISSM_DIR}/externalpackages/petsc/install" # Set to location where external package should be installed
+
+# Download source
+$ISSM_DIR/scripts/DownloadExternalPackage.sh "https://web.cels.anl.gov/projects/petsc/download/release-snapshots/petsc-${VER}.tar.gz" "petsc-${VER}.tar.gz"
+
+# Unpack source
+tar -zxvf petsc-${VER}.tar.gz
+
+# Cleanup
+rm -rf ${PREFIX} ${PETSC_DIR}
+mkdir -p ${PETSC_DIR}
+
+# Move source to $PETSC_DIR
+mv petsc-${VER}/* ${PETSC_DIR}
+rm -rf petsc-${VER}
+
+# Configure
+#
+# NOTE:
+# - Options from,
+#
+# 		cat /nasa/petsc/3.14.5_toss3/lib/petsc/conf/petscvariables | grep CONF
+#
+cd ${PETSC_DIR}
+./configure \
+	--prefix="${PREFIX}" \
+	--PETSC_DIR="${PETSC_DIR}" \
+	--CFLAGS="-g -O3" \
+	--CXXFLAGS="-g -O3" \
+	--FFLAGS="-g -O3" \
+	--with-make-np=10 \
+	--with-batch=1 \
+	--with-pic=1 \
+	--with-shared-libraries=1 \
+	--with-debugging=0 \
+	--with-valgrind=0 \
+	--with-x=0 \
+	--with-ssl=0 \
+	--download-fblaslapack=1 \
+	--download-scalapack=1 \
+	--download-metis=1 \
+	--download-parmetis=1 \
+	--download-mumps=1 
+
+# Compile and install
+make
+make install