--- src/command.h
+++ src/command.h
@@ -304,6 +304,15 @@
 
 /************ Structures ************/
 /* Motif window hints */
+# ifdef LONG64  /* From /usr/include/X11/Xmd.h edited by tres<at>mindspring.com  */
+typedef struct _mwmhints {
+  CARD64 flags;
+  CARD64 functions;
+  CARD64 decorations;
+  INT64  input_mode;
+  CARD64 status;
+} MWMHints;
+# else
 typedef struct _mwmhints {
   CARD32 flags;
   CARD32 functions;
@@ -311,6 +320,8 @@
   INT32  input_mode;
   CARD32 status;
 } MWMHints;
+# endif
+
 # ifdef HAVE_TERMIOS_H
 typedef struct termios ttymode_t;
 # else