diff -up meshlab-Meshlab-2020.07/src/CMakeLists.txt.libdirfix meshlab-Meshlab-2020.07/src/CMakeLists.txt
--- meshlab-Meshlab-2020.07/src/CMakeLists.txt.libdirfix	2020-06-30 21:03:38.000000000 -0400
+++ meshlab-Meshlab-2020.07/src/CMakeLists.txt	2020-07-02 12:10:35.012668622 -0400
@@ -124,8 +124,8 @@ include("${CMAKE_CURRENT_SOURCE_DIR}/ext
 include(GNUInstallDirs)
 if(INSTALL_TO_UNIX_LAYOUT)
     set(MESHLAB_BIN_INSTALL_DIR ${CMAKE_INSTALL_BINDIR})
-    set(MESHLAB_LIB_INSTALL_DIR ${CMAKE_INSTALL_LIBDIR}/meshlab)
-    set(MESHLAB_PLUGIN_INSTALL_DIR ${MESHLAB_LIB_INSTALL_DIR}/plugins)
+    set(MESHLAB_LIB_INSTALL_DIR ${CMAKE_INSTALL_LIBDIR})
+    set(MESHLAB_PLUGIN_INSTALL_DIR ${MESHLAB_LIB_INSTALL_DIR}/meshlab/plugins)
     set(MESHLAB_SHADER_INSTALL_DIR ${CMAKE_INSTALL_DATAROOTDIR}/meshlab/shaders)
     set(MESHLAB_SAMPLE_INSTALL_DIR ${CMAKE_INSTALL_DATAROOTDIR}/meshlab)
 else()