Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 25661)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 25662)
@@ -204,4 +204,16 @@
 	AM_CONDITIONAL([MAC], [test "${IS_MAC}" == "yes"])
 	AC_MSG_RESULT([${IS_MAC}])
+
+	dnl If macOS, check if system copy of libc has fmemopen (if it is not 
+	dnl macOS, we do not check, but still must set SYSTEM_HAS_FMEMOPEN)
+	SYSTEM_FMEMOPEN="no"
+	if test "${IS_MAC}" == "yes"; then
+		AC_MSG_CHECKING([if system libc has fmemopen])
+		if [[ $(system_profiler SPSoftwareDataType | $(which grep) "System Version:" | sed -e "s/[[:space:]]*System Version: macOS //" | cut -d "." -f 2) -ge 13 ]]; then
+			SYSTEM_FMEMOPEN="yes"
+		fi
+	fi
+	AM_CONDITIONAL([SYSTEM_HAS_FMEMOPEN], [test "${SYSTEM_FMEMOPEN}" == "yes"])
+	AC_MSG_RESULT([${SYSTEM_FMEMOPEN}])
 
 	IS_WINDOWS=no
Index: /issm/trunk-jpl/src/c/Makefile.am
===================================================================
--- /issm/trunk-jpl/src/c/Makefile.am	(revision 25661)
+++ /issm/trunk-jpl/src/c/Makefile.am	(revision 25662)
@@ -353,6 +353,8 @@
 	./modules/ModelProcessorx/Dakota/CreateParametersDakota.cpp \
 	./modules/ModelProcessorx/Dakota/UpdateElementsAndMaterialsDakota.cpp \
-	./modules/QmuStatisticsx/QmuStatisticsx.cpp  \
 	./cores/dakota_core.cpp
+	if SYSTEM_FMEMOPEN
+		issm_sources += ./modules/QmuStatisticsx/QmuStatisticsx.cpp
+	fi
 endif
 #}}}