Index: /issm/trunk-jpl/externalpackages/mpich/install-3.0-macosx64-elcapitan.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/mpich/install-3.0-macosx64-elcapitan.sh	(revision 19784)
+++ /issm/trunk-jpl/externalpackages/mpich/install-3.0-macosx64-elcapitan.sh	(revision 19784)
@@ -0,0 +1,38 @@
+# One way to avoid firewall and host-name issues on El Capitan is
+# to use gforker, instead of default hydra, process manager.
+# Note that gforker will only work with a single-node configuration.
+# https://www.mpich.org/static/downloads/3.0.4/mpich-3.0.4-installguide.pdf
+
+#!/bin/bash
+set -eu
+
+#Some cleanup
+rm -rf src install mpich-3.0.4
+mkdir src install
+
+#Download from ISSM server
+$ISSM_DIR/scripts/DownloadExternalPackage.py 'http://issm.jpl.nasa.gov/files/externalpackages/mpich-3.0.4.tar.gz' 'mpich-3.0.4.tar.gz'
+
+#Untar 
+tar -zxvf  mpich-3.0.4.tar.gz
+
+#Move mpich into src directory
+mv mpich-3.0.4/* src
+rm -rf mpich-3.0.4
+
+#Configure mpich
+cd src
+./configure \
+	--prefix="$ISSM_DIR/externalpackages/mpich/install" \
+	--enable-shared \
+        --with-pm=gforker
+
+	#CC=llvm-gcc \
+
+#Compile mpich (this new version supports parallel make)
+if [ $# -eq 0 ]; then
+	make
+else
+	make -j $1
+fi
+make install