diff -Nur assimp-4.1.0/contrib/irrXML/CMakeLists.txt new/contrib/irrXML/CMakeLists.txt
--- assimp-4.1.0/contrib/irrXML/CMakeLists.txt	2017-12-11 14:22:45.000000000 +0100
+++ new/contrib/irrXML/CMakeLists.txt	2018-08-11 20:36:21.068206869 +0200
@@ -17,6 +17,6 @@
 set(IRRXML_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}" CACHE INTERNAL "IrrXML_Include" )
 set(IRRXML_LIBRARY "IrrXML" CACHE INTERNAL "IrrXML" )
 
-install(TARGETS IrrXML
-  ARCHIVE DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
-  COMPONENT ${LIBASSIMP_COMPONENT})
+#install(TARGETS IrrXML
+#  ARCHIVE DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
+#  COMPONENT ${LIBASSIMP_COMPONENT})