diff -Nur assimp-5.0.1/contrib/irrXML/CMakeLists.txt new/contrib/irrXML/CMakeLists.txt
--- assimp-5.0.1/contrib/irrXML/CMakeLists.txt	2020-01-12 12:56:40.000000000 +0100
+++ new/contrib/irrXML/CMakeLists.txt	2020-05-20 01:51:22.652107741 +0200
@@ -21,9 +21,9 @@
 set(IRRXML_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}" CACHE INTERNAL "IrrXML_Include" )
 set(IRRXML_LIBRARY "IrrXML" CACHE INTERNAL "IrrXML" )
 
-install(TARGETS IrrXML
-  LIBRARY DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
-  ARCHIVE DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
-  RUNTIME DESTINATION ${ASSIMP_BIN_INSTALL_DIR}
-  FRAMEWORK DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
-  COMPONENT ${LIBASSIMP_COMPONENT})
+#install(TARGETS IrrXML
+#  LIBRARY DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
+#  ARCHIVE DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
+#  RUNTIME DESTINATION ${ASSIMP_BIN_INSTALL_DIR}
+#  FRAMEWORK DESTINATION ${ASSIMP_LIB_INSTALL_DIR}
+#  COMPONENT ${LIBASSIMP_COMPONENT})