Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 14441)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 14442)
@@ -1026,5 +1026,26 @@
 	AC_MSG_RESULT($HAVE_ML)
 	dnl }}}
-	dnl math{{{
+	dnl umfpack{{{
+		AC_ARG_WITH([umfpack-dir],
+		  AS_HELP_STRING([--with-umfpack-dir=DIR],[UMFPACK root directory]),
+					[UMFPACK_ROOT=$withval],[UMFPACK_ROOT=""])
+
+		AC_MSG_CHECKING(for UMFPACK headers and libraries in $UMFPACK_ROOT)
+		if test -d "$UMFPACK_ROOT"; then
+
+			dnl defaults
+			HAVE_UMFPACK=yes
+			UMFPACKINCL=""
+			UMFPACKLIB=-L"$UMFPACK_ROOT/lib -lumfpack -lumfpack.5.5.1"
+
+			AC_DEFINE([_HAVE_UMFPACK_],[1],[with UMFPACK in ISSM src])
+			AC_SUBST([UMFPACKINCL])
+			AC_SUBST([UMFPACKLIB])
+		else
+			HAVE_UMFPACK=no
+		fi
+		AC_MSG_RESULT($HAVE_UMFPACK)
+	dnl }}}
+dnl math{{{
 	AC_MSG_CHECKING(for math library)
 	AC_ARG_WITH([math-lib],