Index: /issm/trunk-jpl/externalpackages/petsc/install-3.15-discovery.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/petsc/install-3.15-discovery.sh	(revision 26400)
+++ /issm/trunk-jpl/externalpackages/petsc/install-3.15-discovery.sh	(revision 26400)
@@ -0,0 +1,43 @@
+#!/bin/bash
+set -eu
+
+## Constants
+VER="3.15.3"
+
+# Download source
+$ISSM_DIR/scripts/DownloadExternalPackage.sh "https://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-lite-${VER}.tar.gz" "petsc-${VER}.tar.gz"
+
+# Unpack source
+tar -zxvf petsc-${VER}.tar.gz
+
+# Cleanup
+rm -rf install src
+mkdir install src
+
+# Move source to 'src' directory
+mv petsc-${VER}/* src/
+rm -rf petsc-${VER}
+
+cd src
+./config/configure.py \
+        COPTFLAGS="-g -O3" CXXOPTFLAGS="-g -O3" FOPTFLAGS="-g -O3" \
+		  --with-make-np=20 \
+        --with-blas-lapack-dir=$MKL_ROOT \
+        --with-mpi-dir="/optnfs/el7/mpich/3.3-intel19.3/" \
+        --known-mpi-shared-libraries=1 \
+        --known-mpi-long-double=1 \
+        --known-mpi-int64_t=1 \
+        --known-mpi-c-double-complex=1 \
+        --with-debugging=0 \
+        --with-valgrind=0 \
+        --with-x=0 \
+        --with-ssl=0 \
+        --with-pic=1 \
+        --download-metis=1 \
+        --download-parmetis=1 \
+        --download-scalapack=1 \
+        --download-mumps=1
+
+# Compile and install
+make
+make install