Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 25715)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 25716)
@@ -210,5 +210,5 @@
 	SYSTEM_FMEMOPEN=1
 	if test "${IS_MAC}" == "yes"; then
-		if [[ $(system_profiler SPSoftwareDataType | /usr/bin/grep "System Version:" | sed -e "s/[[:space:]]*System Version: macOS //" | cut -d "." -f 2) -lt 13 ]]; then
+		if [[ $(system_profiler SPSoftwareDataType | grep "System Version:" | sed -e "s/[[:space:]]*System Version: macOS //" | cut -d "." -f 2) -lt 13 ]]; then
 			SYSTEM_FMEMOPEN=0
 		fi
@@ -378,7 +378,7 @@
 			*)
 				MATLABINCL="-I${MATLAB_ROOT}/extern/include"
-				MEXLINK=$(${MATLAB_ROOT}/bin/mex -v 2>&1 < /dev/null | /usr/bin/grep LDFLAGS | sed -e "s/         LDFLAGS            = //g")
-				MEXLIB=$(${MATLAB_ROOT}/bin/mex -v 2>&1 < /dev/null | /usr/bin/grep CXXLIBS | sed -e "s/         CXXLIBS            = //g")
-				MEXEXT=$(${MATLAB_ROOT}/bin/mex -v 2>&1 < /dev/null | /usr/bin/grep LDEXTENSION | sed -e "s/         LDEXTENSION        = //g")
+				MEXLINK=$(${MATLAB_ROOT}/bin/mex -v 2>&1 < /dev/null | grep LDFLAGS | sed -e "s/         LDFLAGS            = //g")
+				MEXLIB=$(${MATLAB_ROOT}/bin/mex -v 2>&1 < /dev/null | grep CXXLIBS | sed -e "s/         CXXLIBS            = //g")
+				MEXEXT=$(${MATLAB_ROOT}/bin/mex -v 2>&1 < /dev/null | grep LDEXTENSION | sed -e "s/         LDEXTENSION        = //g")
 				dnl version 2014 and up
 				if test -z "${MEXEXT}"; then
@@ -387,7 +387,7 @@
 					${MATLAB_ROOT}/bin/mex -v -lmex conftest.cpp > conftest.tmp 2>&1
 					rm -f conftest.cpp
-					MEXLINK=$(cat conftest.tmp | /usr/bin/grep LDFLAGS | sed -e "s/LDFLAGS ://g")
-					MEXLIB=$(cat conftest.tmp | /usr/bin/grep LINKLIBS | sed -e "s/LINKLIBS ://g")
-					MEXEXT=$(cat conftest.tmp | /usr/bin/grep LDEXT | sed -e "s/LDEXT ://g" | awk '{print $[1]}')
+					MEXLINK=$(cat conftest.tmp | grep LDFLAGS | sed -e "s/LDFLAGS ://g")
+					MEXLIB=$(cat conftest.tmp | grep LINKLIBS | sed -e "s/LINKLIBS ://g")
+					MEXEXT=$(cat conftest.tmp | grep LDEXT | sed -e "s/LDEXT ://g" | awk '{print $[1]}')
 					if test -z "${MEXEXT}"; then
 					 cat conftest.tmp
@@ -508,5 +508,5 @@
 		#BOOSTLIB="-L$BOOST_ROOT/lib -lboost_python"
 		AC_MSG_CHECKING(for Boost version)
-		BOOST_VERSION=`cat ${BOOST_ROOT}/include/boost/version.hpp | /usr/bin/grep "#define BOOST_VERSION " | sed 's/.*BOOST_VERSION //'`
+		BOOST_VERSION=`cat ${BOOST_ROOT}/include/boost/version.hpp | grep "#define BOOST_VERSION " | sed 's/.*BOOST_VERSION //'`
 		BOOST_VERSION_MAJOR=`expr ${BOOST_VERSION} / 100000`
 		BOOST_VERSION_MINOR=`expr ${BOOST_VERSION} / 100 % 1000`
@@ -548,11 +548,11 @@
 		DAKOTA_VERSION_OUTPUT=`${DAKOTA_ROOT}/bin/dakota -v`
 		if test -n "${DAKOTA_VERSION_OUTPUT}"; then
-			DAKOTA_VERSION=`echo ${DAKOTA_VERSION_OUTPUT} /usr/bin/grep "Dakota version" | sed 's/Dakota version //' | sed 's/ .*//'`
+			DAKOTA_VERSION=`echo ${DAKOTA_VERSION_OUTPUT} grep "Dakota version" | sed 's/Dakota version //' | sed 's/ .*//'`
 		elif test -f "${DAKOTA_ROOT}/VERSION"; then
-			DAKOTA_VERSION=`cat ${DAKOTA_ROOT}/VERSION | /usr/bin/grep 'DAKOTA Version' | sed 's/.*DAKOTA Version //' | sed 's/ .*//'`
+			DAKOTA_VERSION=`cat ${DAKOTA_ROOT}/VERSION | grep 'DAKOTA Version' | sed 's/.*DAKOTA Version //' | sed 's/ .*//'`
 		elif test -f "${DAKOTA_ROOT}/../src/src/CommandLineHandler.C"; then
-			DAKOTA_VERSION=`cat ${DAKOTA_ROOT}/../src/src/CommandLineHandler.C | /usr/bin/grep 'DAKOTA version' | /usr/bin/grep 'release' | /usr/bin/grep -v // | sed 's/.*DAKOTA version //' | sed 's/ .*//' `
+			DAKOTA_VERSION=`cat ${DAKOTA_ROOT}/../src/src/CommandLineHandler.C | grep 'DAKOTA version' | grep 'release' | grep -v // | sed 's/.*DAKOTA version //' | sed 's/ .*//' `
 		elif test -f "${DAKOTA_ROOT}/../src/src/CommandLineHandler.cpp"; then
-			DAKOTA_VERSION=`cat ${DAKOTA_ROOT}/../src/src/CommandLineHandler.cpp | /usr/bin/grep 'DAKOTA version' | /usr/bin/grep 'release' | /usr/bin/grep -v // | sed 's/.*DAKOTA version //' | sed 's/ .*//' `
+			DAKOTA_VERSION=`cat ${DAKOTA_ROOT}/../src/src/CommandLineHandler.cpp | grep 'DAKOTA version' | grep 'release' | grep -v // | sed 's/.*DAKOTA version //' | sed 's/ .*//' `
 		else
 			AC_MSG_ERROR([Dakota CommandLineHandler.C or CommandLineHandler.cpp file not found to determine DAKOTA_VERSION!]);
@@ -1213,6 +1213,6 @@
 
 		AC_MSG_CHECKING(for PETSc version)
-		PETSC_MAJOR=`cat ${PETSC_ROOT}/include/petscversion.h | /usr/bin/grep "#define PETSC_VERSION_MAJOR" | sed 's/#define PETSC_VERSION_MAJOR//' | sed 's/ //g'`
-		PETSC_MINOR=`cat ${PETSC_ROOT}/include/petscversion.h | /usr/bin/grep "#define PETSC_VERSION_MINOR" | sed 's/#define PETSC_VERSION_MINOR//' | sed 's/ //g'`
+		PETSC_MAJOR=`cat ${PETSC_ROOT}/include/petscversion.h | grep "#define PETSC_VERSION_MAJOR" | sed 's/#define PETSC_VERSION_MAJOR//' | sed 's/ //g'`
+		PETSC_MINOR=`cat ${PETSC_ROOT}/include/petscversion.h | grep "#define PETSC_VERSION_MINOR" | sed 's/#define PETSC_VERSION_MINOR//' | sed 's/ //g'`
 		AC_DEFINE_UNQUOTED([_PETSC_MAJOR_], [$PETSC_MAJOR], [PETSc version major])
 		AC_DEFINE_UNQUOTED([_PETSC_MINOR_], [$PETSC_MINOR], [PETSc version minor])
@@ -1220,5 +1220,5 @@
 
 		AC_MSG_CHECKING(whether PETSc is the development version)
-		PETSC_RELEASE=`cat ${PETSC_ROOT}/include/petscversion.h | /usr/bin/grep "#define PETSC_VERSION_RELEASE" | sed 's/#define PETSC_VERSION_RELEASE//' | sed 's/ //g'`
+		PETSC_RELEASE=`cat ${PETSC_ROOT}/include/petscversion.h | grep "#define PETSC_VERSION_RELEASE" | sed 's/#define PETSC_VERSION_RELEASE//' | sed 's/ //g'`
 		if test "${PETSC_RELEASE}" == "0"; then
 			AC_DEFINE([_HAVE_PETSCDEV_], [1], [with PETSc-dev])
@@ -2210,5 +2210,5 @@
 		else
 			if test -f "${PETSC_ROOT}/conf/petscvariables"; then
-				PETSC_REC_GRAPHICS_LIB=$(cat ${PETSC_ROOT}/conf/petscvariables | /usr/bin/grep X_LIB)
+				PETSC_REC_GRAPHICS_LIB=$(cat ${PETSC_ROOT}/conf/petscvariables | grep X_LIB)
 				AC_MSG_ERROR([Xlib (graphics library) provided (${GRAPHICS_LIB}) does not exist! PETSc suggests the following library: ${PETSC_REC_GRAPHICS_LIB}]);
 			fi
@@ -2349,5 +2349,5 @@
 
 		AC_MSG_CHECKING(for Gmsh version)
-		GMSH_VERSION_MAJOR=`${GMSH_ROOT}/bin/gmsh -info | /usr/bin/grep "Version" | sed -e "s/Version@<:@@<:@:blank:@:>@@:>@*:@<:@@<:@:blank:@:>@@:>@//" | cut -d "." -f 1`
+		GMSH_VERSION_MAJOR=`${GMSH_ROOT}/bin/gmsh -info | grep "Version" | sed -e "s/Version@<:@@<:@:blank:@:>@@:>@*:@<:@@<:@:blank:@:>@@:>@//" | cut -d "." -f 1`
 		AC_MSG_RESULT([${GMSH_VERSION_MAJOR}])
 		AC_DEFINE_UNQUOTED(_GMSH_VERSION_MAJOR_, $GMSH_VERSION_MAJOR, [Gmsh major version])