2 files changed, 4 insertions, 3 deletions

diff --git a/src/config.in b/src/config.in
index abb3f114918..89858d31daf 100644
--- a/src/config.in
+++ b/src/config.in
@@ -96,6 +96,7 @@ and this notice must be preserved on all copies.  */
 #undef STACK_DIRECTION
 #undef const
 #undef UNEXEC_SRC
+#undef HAVE_LIBDNET
 
 /* If using GNU, then support inline function declarations. */
 #ifdef __GNUC__
diff --git a/src/m/pmax.h b/src/m/pmax.h
index 8cbc258dde7..bd3b298a960 100644
--- a/src/m/pmax.h
+++ b/src/m/pmax.h
@@ -50,10 +50,10 @@ NOTE-END  */
 #define HAVE_ALLOCA
 #endif
 
-/* mcc@timessqr.gc.cuny.edu says this makes Emacs work with DECnet.
-   If you don't have DECnet and this causes trouble,
-   just delete the definition.  */
+/* mcc@timessqr.gc.cuny.edu says this makes Emacs work with DECnet.  */
+#ifdef HAVE_LIBDNET
 #define LIBS_MACHINE -ldnet
+#endif
 
 /* mcc@timessqr.gc.cuny.edu says it is /vmunix on Ultrix 4.2a.  */
 #undef KERNEL_FILE