diff --git a/cmake/QtProcessConfigureArgs.cmake b/cmake/QtProcessConfigureArgs.cmake
index cb92c0fbca6..8fb8d2f6a50 100644
--- a/cmake/QtProcessConfigureArgs.cmake
+++ b/cmake/QtProcessConfigureArgs.cmake
@@ -75,6 +75,12 @@ while(configure_args)
     elseif(arg STREQUAL "-qt-host-path")
         pop_path_argument()
         push("-DQT_HOST_PATH=${path}")
+    elseif(arg STREQUAL "-hostdatadir")
+        pop_path_argument()
+        if(NOT path MATCHES "(^|/)mkspecs$")
+            string(APPEND path "/mkspecs")
+        endif()
+        push("-DINSTALL_MKSPECSDIR=${path}")
     elseif(arg MATCHES "^-host.*dir")
         message(FATAL_ERROR "${arg} is not supported anymore.")
     elseif(arg STREQUAL "--")
diff --git a/cmake/configure-cmake-mapping.md b/cmake/configure-cmake-mapping.md
index a1f5006d4d8..b5e528f1e28 100644
--- a/cmake/configure-cmake-mapping.md
+++ b/cmake/configure-cmake-mapping.md
@@ -9,6 +9,7 @@ The effort of this is tracked in QTBUG-85373 and QTBUG-85349.
 | -hostprefix  /where/ever              | n/a                                               | When cross-building Qt, we do not build for host system anymore |
 | -external-hostbindir /path/to/host/qt | -DQT_HOST_PATH=/path/to/host/qt                   |                                                                 |
 | -bindir <dir>                         | -DINSTALL_BINDIR=<dir>                            | similar for -headerdir -libdir and so on                        |
+| -hostdatadir <dir>                    | -DINSTALL_MKSPECSDIR=<dir>                        |                                                                 |
 | -host*dir <dir>                       | n/a                                               |                                                                 |
 | -help                                 | n/a                                               | Handled by configure[.bat].                                     |
 | -verbose                              |                                                   |                                                                 |