Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 25649)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 25650)
@@ -2492,19 +2492,9 @@
 	dnl optimization{{{
 	dnl -- bypass standard optimization -g -O2 -fPIC -std=c++11?
-	dnl NOTE: Added -Wno-deprecated-register flag to clear,
-	dnl
-	dnl		externalpackages/dakota/install/include/MPIPackBuffer.hpp:301:8: warning: 
-	dnl		'register' storage class specifier is deprecated and incompatible with
-	dnl		C++17 [-Wdeprecated-register]
-	dnl		for (register typename ContainerT::size_type i=0; i<len; ++i) {
-	dnl
-	dnl when Dakota 6.2 is installed (may be an issue in other versions; likely 
-	dnl will not be needed at all in future versions)
-	dnl
 	AC_ARG_WITH(
 		[cxxoptflags],
-		AS_HELP_STRING([--with-cxxoptflags=CXXOPTFLAGS], [C++ optimization flags (i.e. --with-cxxoptflags="-march=opteron -O3 -std=c++11 -Wno-deprecated-register"]),
+		AS_HELP_STRING([--with-cxxoptflags=CXXOPTFLAGS], [C++ optimization flags (i.e. --with-cxxoptflags="-march=opteron -O3 -std=c++11"]),
 		[CXXOPTFLAGS=${withval}],
-		[CXXOPTFLAGS="-g -O2 -fPIC -std=c++11 -Wno-deprecated-register"]
+		[CXXOPTFLAGS="-g -O2 -fPIC -std=c++11"]
 	)
 	AC_MSG_CHECKING(for C++ optimization flags)