diff --git a/BESM6/besm6_mmu.c b/BESM6/besm6_mmu.c
index 498841db0..2db7bcb34 100644
--- a/BESM6/besm6_mmu.c
+++ b/BESM6/besm6_mmu.c
@@ -56,7 +56,7 @@ uint32 BRSLRU;
 t_value RP[8];
 uint32 TLB[32];
 
-unsigned iintr_data;    /* protected page number or parity check location */
+uint32 iintr_data;    /* protected page number or parity check location */
 
 /* There were several hardwired configurations of registers
  * corresponding to up to 7 first words of the memory space, selected by
diff --git a/BESM6/besm6_panel.c b/BESM6/besm6_panel.c
index 74eba251d..162c9381b 100644
--- a/BESM6/besm6_panel.c
+++ b/BESM6/besm6_panel.c
@@ -620,6 +620,7 @@ t_stat besm6_close_panel (UNIT *u, int32 val, char *cptr, void *desc)
 
 t_stat besm6_show_panel (FILE *st, struct sim_unit *up, int32 v, void *dp)
 {
+    return SCPE_NOTATT;
 }
 
 void besm6_draw_panel (int force)
diff --git a/VAX/vax_lk.c b/VAX/vax_lk.c
index 06d3a371a..3b66a8154 100644
--- a/VAX/vax_lk.c
+++ b/VAX/vax_lk.c
@@ -829,4 +829,6 @@ switch (mode) {
     }            
 }
 
-#endif /* !VAX_620 */
+#else /* defined(VAX_620) */
+static char *dummy_declaration = "Something to compile";
+#endif /* !defined(VAX_620) */
diff --git a/VAX/vax_vc.c b/VAX/vax_vc.c
index 412b31ca2..c3503d6be 100644
--- a/VAX/vax_vc.c
+++ b/VAX/vax_vc.c
@@ -1097,4 +1097,6 @@ char *vc_description (DEVICE *dptr)
 return "VCB01 Monochrome Graphics Adapter";
 }
 
-#endif /* !VAX_620 */
+#else /* defined(VAX_620) */
+static char *dummy_declaration = "Something to compile";
+#endif /* !defined(VAX_620) */
diff --git a/VAX/vax_vs.c b/VAX/vax_vs.c
index 1d3946d29..417d4962c 100644
--- a/VAX/vax_vs.c
+++ b/VAX/vax_vs.c
@@ -240,4 +240,6 @@ if (vs_state == VSXXX_IDLE) {
     }
 }
 
-#endif /* !VAX_620 */
+#else /* defined(VAX_620) */
+static char *dummy_declaration = "Something to compile";
+#endif /* !defined(VAX_620) */
diff --git a/descrip.mms b/descrip.mms
index 93d9afda3..fc7c84fc4 100644
--- a/descrip.mms
+++ b/descrip.mms
@@ -9,14 +9,16 @@
 # the SIMH package for OpenVMS using DEC C v6.0-001(AXP), v6.5-001(AXP),
 # HP C V7.3-009-48GBT (AXP), HP C V7.2-001 (IA64) and v6.4-005(VAX).
 #
-# Notes:  On VAX, the PDP-10, Eclipse and IBM 7094 simulators will not be 
-#         built due to the fact that INT64 is required for these simulators.
+# Notes:  On VAX, the PDP-10, Eclipse, IBM 7094 and BESM6 simulators will
+#         not be built due to the fact that INT64 is required for these 
+#         simulators.
 #
 # This build script will accept the following build options.
 #
 #            ALL             Just Build "Everything".
 #            ALTAIR          Just Build The MITS Altair.
 #            ALTAIRZ80       Just Build The MITS Altair Z80.
+#            BESM6           Just Build The BESM-6.
 #            ECLIPSE         Just Build The Data General Eclipse.
 #            GRI             Just Build The GRI Corporation GRI-909.
 #            LGP             Just Build The Royal-McBee LGP-30.
@@ -627,6 +629,18 @@ SWTP6800MP_A2_SOURCE = $(SWTP6800MP_A2_COMMON)mp-a2.c,$(SWTP6800MP_A2_COMMON)m68
 	$(SWTP6800MP_A2_COMMON)mp-8m.c,$(SWTP6800MP_A2_COMMON)i2716.c
 SWTP6800MP_A2_OPTIONS = /INCL=($(SIMH_DIR),$(SWTP6800MP_A2_DIR))/DEF=($(CC_DEFS))
 
+
+#
+# BESM6
+#
+BESM6_DIR = SYS$DISK:[.BESM6]
+BESM6_LIB = $(LIB_DIR)BESM6-$(ARCH).OLB
+BESM6_SOURCE = $(BESM6_DIR)BESM6_CPU.C,$(BESM6_DIR)BESM6_SYS.C,$(BESM6_DIR)BESM6_MMU.C,\
+	$(BESM6_DIR)BESM6_ARITH.C,$(BESM6_DIR)BESM6_DISK.C,$(BESM6_DIR)BESM6_DRUM.C,\
+	$(BESM6_DIR)BESM6_TTY.C,$(BESM6_DIR)BESM6_PANEL.C,$(BESM6_DIR)BESM6_PRINTER.C,\
+	$(BESM6_DIR)BESM6_PUNCH.C
+BESM6_OPTIONS = /INCL=($(SIMH_DIR),$(BESM6_DIR))/DEF=($(CC_DEFS),"USE_INT64=1")
+
 #
 # Digital Equipment VAX 3900 Simulator Definitions.
 #
@@ -889,7 +903,7 @@ I7094_OPTIONS = /INCL=($(SIMH_DIR),$(I7094_DIR))/DEF=($(CC_DEFS))
 ALL : ALTAIR ALTAIRZ80 ECLIPSE GRI LGP H316 HP2100 I1401 I1620 IBM1130 ID16 \
       ID32 NOVA PDP1 PDP4 PDP7 PDP8 PDP9 PDP10 PDP11 PDP15 S3 \
       VAX MICROVAX3900 MICROVAX1 RTVAX1000 MICROVAX2 VAX730 VAX750 VAX780 VAX8600 \
-      SDS I7094 SWTP6800MP-A SWTP6800MP-A2 SSEM
+      SDS I7094 SWTP6800MP-A SWTP6800MP-A2 SSEM BESM6
         $! No further actions necessary
 .ELSE
 #
@@ -1314,6 +1328,17 @@ $(SWTP6800MP_A2_LIB) : $(SWTP6800MP_A2_SOURCE)
         $ LIBRARY/REPLACE $(MMS$TARGET) $(BLD_DIR)*.OBJ
         $ DELETE/NOLOG/NOCONFIRM $(BLD_DIR)*.OBJ;*
 
+$(BESM6_LIB) : $(BESM6_SOURCE)
+        $!
+        $! Building The $(BESM6_LIB) Library.
+        $!
+        $ $(CC)$(BESM6_OPTIONS) -
+               /OBJ=$(BLD_DIR) $(MMS$CHANGED_LIST)
+        $ IF (F$SEARCH("$(MMS$TARGET)").EQS."") THEN -
+             LIBRARY/CREATE $(MMS$TARGET)
+        $ LIBRARY/REPLACE $(MMS$TARGET) $(BLD_DIR)*.OBJ
+        $ DELETE/NOLOG/NOCONFIRM $(BLD_DIR)*.OBJ;*
+
 $(VAX_LIB1) : $(VAX_SOURCE1)
         $!
         $! Building The $(VAX_LIB1) Library.
@@ -1878,6 +1903,18 @@ $(BIN_DIR)SWTP6800MP-A2-$(ARCH).EXE : $(SIMH_MAIN) $(SIMH_NONET_LIB) $(SWTP6800M
                $(BLD_DIR)SCP.OBJ,$(SWTP6800MP_A2_LIB)/LIBRARY,$(SIMH_NONET_LIB)/LIBRARY
         $ DELETE/NOLOG/NOCONFIRM $(BLD_DIR)*.OBJ;*
 
+BESM6 : $(BIN_DIR)BESM6-$(ARCH).EXE
+        $! BESM6 done
+
+$(BIN_DIR)BESM6-$(ARCH).EXE : $(SIMH_MAIN) $(SIMH_NONET_LIB) $(BESM6_LIB)
+        $!
+        $! Building The $(BIN_DIR)BESM6-$(ARCH).EXE Simulator.
+        $!
+        $ $(CC)$(BESM6_OPTIONS)/OBJ=$(BLD_DIR) SCP.C
+        $ LINK $(LINK_DEBUG)/EXE=$(BIN_DIR)BESM6-$(ARCH).EXE -
+                 $(BLD_DIR)SCP.OBJ,$(BESM6_LIB)/LIBRARY,$(SIMH_NONET_LIB)/LIBRARY
+        $ DELETE/NOLOG/NOCONFIRM $(BLD_DIR)*.OBJ;*
+
 VAX : MICROVAX3900
         $! MICROVAX3900 aka VAX done
 
diff --git a/sim_console.c b/sim_console.c
index d94088e11..d300bf7a6 100644
--- a/sim_console.c
+++ b/sim_console.c
@@ -1797,9 +1797,9 @@ return sim_show_send_input (st, &sim_con_send);
 
 t_stat sim_poll_kbd (void)
 {
-int32 c;
+t_stat c;
 
-if (sim_send_poll_data (&sim_con_send, &c))             /* injected input characters available? */
+if (sim_send_poll_data (&sim_con_send, &c))                 /* injected input characters available? */
     return c;
 if (!sim_rem_master_mode) {
     c = sim_os_poll_kbd ();                                 /* get character */
@@ -1819,8 +1819,8 @@ if (!sim_rem_master_mode) {
             return SCPE_OK;                                 /* unconnected and buffered - nothing to receive */
         }
     }
-tmxr_poll_rx (&sim_con_tmxr);                           /* poll for input */
-if ((c = tmxr_getc_ln (&sim_con_ldsc)))                 /* any char? */ 
+tmxr_poll_rx (&sim_con_tmxr);                               /* poll for input */
+if ((c = (t_stat)tmxr_getc_ln (&sim_con_ldsc)))             /* any char? */ 
     return (c & (SCPE_BREAK | 0377)) | SCPE_KFLAG;
 return SCPE_OK;
 }
diff --git a/sim_tmxr.c b/sim_tmxr.c
index f7e0c1534..e679e3dd9 100644
--- a/sim_tmxr.c
+++ b/sim_tmxr.c
@@ -1539,7 +1539,8 @@ return (lp->rxbpi - lp->rxbpr);
 
 int32 tmxr_getc_ln (TMLN *lp)
 {
-int32 j, val = 0;
+int32 j; 
+t_stat val = 0;
 uint32 tmp;
 
 tmxr_debug_trace_line (lp, "tmxr_getc_ln()");
diff --git a/sim_video.c b/sim_video.c
index 7b1696506..9416a01c5 100644
--- a/sim_video.c
+++ b/sim_video.c
@@ -1818,13 +1818,13 @@ while (_show_stat == -1)
 return _show_stat;
 }
 
-#else
+#else /* !defined(HAVE_LIBSDL) */
 
 /* Non-implemented versions */
 
 uint32 vid_mono_palette[2];                             /* Monochrome Color Map */
 
-t_stat vid_open (DEVICE *dptr, uint32 width, uint32 height, int32 flags)
+t_stat vid_open (DEVICE *dptr, uint32 width, uint32 height, int flags)
 {
 return SCPE_NOFNC;
 }
@@ -1886,6 +1886,8 @@ fprintf (st, "video support unavailable");
 return SCPE_OK;
 }
 
-#endif
+#endif /* defined(HAVE_LIBSDL) */
 
-#endif /* USE_SIM_VIDEO */
+#else /* !defined(USE_SIM_VIDEO) */
+static char *dummy_declaration = "Something to compile";
+#endif /* defined(USE_SIM_VIDEO) */