Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 25657)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 25658)
@@ -204,19 +204,4 @@
 	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 | $(which grep) "System Version:" | sed -e "s/[[:space:]]*System Version: macOS //" | cut -d "." -f 2) -ge 13 ]]; then
-			SYSTEM_FMEMOPEN="yes"
-			AC_DEFINE([_SYSTEM_FMEMOPEN_], [1], [does system libc have fmemopen])
-		else
-			AC_DEFINE([_SYSTEM_FMEMOPEN_], [0], [does system libc have fmemopen])
-		fi
-	fi
-	AM_CONDITIONAL([SYSTEM_HAS_FMEMOPEN], [test "${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 25657)
+++ /issm/trunk-jpl/src/c/Makefile.am	(revision 25658)
@@ -22,13 +22,4 @@
 #Core sources
 issm_sources =
-
-#GLIBC sources {{{
-if MAC
-if !SYSTEM_HAS_FMEMOPEN
-issm_sources += \
-	./ext/fmemopen/fmemopen.c
-endif
-endif
-#}}}
 
 #BAMG sources  {{{
Index: /issm/trunk-jpl/src/c/modules/QmuStatisticsx/QmuStatisticsx.h
===================================================================
--- /issm/trunk-jpl/src/c/modules/QmuStatisticsx/QmuStatisticsx.h	(revision 25657)
+++ /issm/trunk-jpl/src/c/modules/QmuStatisticsx/QmuStatisticsx.h	(revision 25658)
@@ -6,8 +6,4 @@
 
 #include "../../classes/classes.h"
-
-#if _MAC_ && !_SYSTEM_FMEMOPEN_
-#include "../../ext/fmemopen/fmemopen.h"
-#endif
 
 int ComputeMeanVariance(Parameters* parameters,Results* results,int color, ISSM_MPI_Comm statcomm);