diff -r 93ef210e9b56 -r 00a6a77face6 configure.ac
--- a/configure.ac	Sun Jul 08 13:40:31 2018 +0200
+++ b/configure.ac	Tue Jul 10 16:49:05 2018 +0200
@@ -152,21 +152,38 @@
 fi
 
 #------------------------------------------------------------------------------
+# Linux module installation directory
+#------------------------------------------------------------------------------
+
+AC_ARG_WITH([module-path],
+    AC_HELP_STRING(
+        [--with-module-path=<DIR>],
+        [Linux module installation path. Default: /lib/modules/kernel_version]
+    ),
+    [modpathdefs="INSTALL_MOD_PATH='$withval'"],
+    [modpathdefs=""]
+)
+
+AC_MSG_CHECKING([for Linux modules installation directory])
+AC_MSG_RESULT([$with_mod_path])
+
+#------------------------------------------------------------------------------
 # Linux module installation subdirectory
 #------------------------------------------------------------------------------
 
 AC_ARG_WITH([module-dir],
     AC_HELP_STRING(
         [--with-module-dir=<DIR>],
-        [Linux module installation dir. Default: ethercat]
-    ),
-    [moddir=[$withval]],
-    [moddir="ethercat"]
-)
-AC_SUBST(INSTALL_MOD_DIR,[$moddir])
-
-AC_MSG_CHECKING([for Linux modules installation directory])
-AC_MSG_RESULT([$INSTALL_MOD_DIR])
+        [Linux module installation subdir. Default: ethercat]
+    ),
+    [modpathdefs="$modpathdefs INSTALL_MOD_DIR='$withval'"],
+    [modpathdefs=""]
+)
+
+AC_MSG_CHECKING([for Linux modules installation subdirectory])
+AC_MSG_RESULT([$with_mod_dir])
+
+AC_SUBST(INSTALL_MOD_PATH_DEFS,[$modpathdefs])
 
 #------------------------------------------------------------------------------
 # Generic Ethernet driver