--- CMakeLists.txt	2017-04-17 07:31:11.000000000 -0600
+++ CMakeLists_new.txt	2017-07-16 19:39:43.597509953 -0600
@@ -460,21 +460,34 @@
 source_group("Include\\M68K" FILES ${HEADERS_M68K})
 source_group("Include\\TMS320C64x" FILES ${HEADERS_TMS320C64X})
 
+### test library 64bit routine:
+get_property(LIB64 GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS)
+
+if ("${LIB64}" STREQUAL "TRUE")
+    set(LIBSUFFIX 64)
+else()
+    set(LIBSUFFIX "")
+endif()
+
+set(INSTALL_LIB_DIR     lib${LIBSUFFIX} CACHE PATH "Installation directory for libraries")
+mark_as_advanced(INSTALL_LIB_DIR)
+
+
 ## installation
 install(FILES ${HEADERS_COMMON} DESTINATION include/capstone)
 
 if (CAPSTONE_BUILD_STATIC)
     install(TARGETS capstone-static
             RUNTIME DESTINATION bin
-            LIBRARY DESTINATION lib
-            ARCHIVE DESTINATION lib)
+            LIBRARY DESTINATION ${INSTALL_LIB_DIR}
+            ARCHIVE DESTINATION ${INSTALL_LIB_DIR})
 endif ()
 
 if (CAPSTONE_BUILD_SHARED)
     install(TARGETS capstone-shared
             RUNTIME DESTINATION bin
-            LIBRARY DESTINATION lib
-            ARCHIVE DESTINATION lib)
+            LIBRARY DESTINATION ${INSTALL_LIB_DIR}
+            ARCHIVE DESTINATION ${INSTALL_LIB_DIR})
 endif ()
 
 if (CAPSTONE_BUILD_SHARED)