add a Transposition section in page 2

CMakeLists.txt

@@ -220,6 +220,17 @@ else()
   )
 endif()
 
+# similar to set_target_properties but append the property instead of overwriting it
+macro(ei_add_target_property target prop value)
+
+  get_target_property(previous ${target} ${prop})
+  # if the property wasn't previously set, ${previous} is now "previous-NOTFOUND" which cmake allows catching with plain if()
+  if(NOT previous)
+    set(previous "")
+  endif(NOT previous)
+  set_target_properties(${target} PROPERTIES ${prop} "${previous} ${value}")
+endmacro(ei_add_target_property)
+
 install(FILES
   signature_of_eigen3_matrix_library
   DESTINATION ${INCLUDE_INSTALL_DIR} COMPONENT Devel