Index: MultiSource/Benchmarks/DOE-ProxyApps-C/CMakeLists.txt
===================================================================
--- MultiSource/Benchmarks/DOE-ProxyApps-C/CMakeLists.txt
+++ MultiSource/Benchmarks/DOE-ProxyApps-C/CMakeLists.txt
@@ -1,8 +1,13 @@
-add_subdirectory(XSBench)
+# XSBench and RSBench have problems running on CSKY.
+# The biggest alignment of CSKY is 4 bytes so that the expected
+# Est. Memory Usage is different with reference output.
+if(NOT ARCH STREQUAL "CSKY")
+  add_subdirectory(XSBench)
+  add_subdirectory(RSBench)
+endif()
 add_subdirectory(Pathfinder)
 add_subdirectory(miniAMR)
 add_subdirectory(miniGMG)
-add_subdirectory(RSBench)
 add_subdirectory(SimpleMOC)
 if(NOT CMAKE_SYSTEM_NAME MATCHES "AIX")
 add_subdirectory(CoMD)