Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 26807)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 26808)
@@ -211,5 +211,5 @@
 	if test "${IS_MAC}" == "yes"; then
 		sys_ver=$(sw_vers -productVersion)
-		if [[ $(echo ${sys_ver} | cut -d "." -f 1) -eq 10 && $(echo ${sys_ver} | cut -d "." -f 2) -eq 13 ]]; then
+		if test $(echo ${sys_ver} | cut -d "." -f 1) -eq 10 && test $(echo ${sys_ver} | cut -d "." -f 2) -lt 13; then
 			SYSTEM_FMEMOPEN=0
 		fi
@@ -2722,5 +2722,5 @@
 	)
 	dnl Check that supplied value is an integer
-	if [[ "${NUMTHREADS_VALUE}" != "${NUMTHREADS_VALUE}" 2> /dev/null ]]; then
+	if test "${NUMTHREADS_VALUE}" != "${NUMTHREADS_VALUE}"; then
 		AC_MSG_ERROR([Number of threads provided (${NUMTHREADS_VALUE}) is not an integer!]);
 	elif test "${NUMTHREADS_VALUE}" == "0"; then