diff -up meshlab-Meshlab-2021.07/src/CMakeLists.txt.libdirfix meshlab-Meshlab-2021.07/src/CMakeLists.txt

--- meshlab-Meshlab-2021.07/src/CMakeLists.txt.libdirfix	2021-09-20 13:53:47.095514858 -0400

+++ meshlab-Meshlab-2021.07/src/CMakeLists.txt	2021-09-20 13:55:06.602952041 -0400

@@ -50,8 +50,8 @@ if (USE_DEFAULT_BUILD_AND_INSTALL_DIRS)

 	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)

 	elseif(APPLE)

 		set(MESHLAB_BIN_INSTALL_DIR .)