--- python/thermofun/CMakeLists.txt.orig	2022-07-17 19:24:14 UTC
+++ python/thermofun/CMakeLists.txt
@@ -43,7 +43,7 @@ install(CODE
     endif()
 
     execute_process(
-        COMMAND ${PYTHON_EXECUTABLE} ${SETUP_PY} install --prefix=\${THERMOFUN_PYTHON_INSTALL_PREFIX_NATIVE}
+        COMMAND ${PYTHON_EXECUTABLE} ${SETUP_PY} install --root=${FREEBSD_STAGEDIR} --prefix=\${THERMOFUN_PYTHON_INSTALL_PREFIX_NATIVE}
         WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
 "
 )
