diff -up VTK-9.0.0/ThirdParty/libharu/CMakeLists.txt.libharu VTK-9.0.0/ThirdParty/libharu/CMakeLists.txt
--- VTK-9.0.0/ThirdParty/libharu/CMakeLists.txt.libharu	2020-05-01 13:29:00.000000000 -0600
+++ VTK-9.0.0/ThirdParty/libharu/CMakeLists.txt	2020-05-12 16:47:18.298133406 -0600
@@ -8,7 +8,7 @@ vtk_module_third_party(
     # Unreleased. Requires these PRs:
     # https://github.com/libharu/libharu/pull/157
     # https://github.com/libharu/libharu/pull/187
-    VERSION 2.4.0
+    VERSION 2.3.0
     TARGETS LibHaru::LibHaru
     STANDARD_INCLUDE_DIRS)