diff --git a/.travis.yml b/.travis.yml
index e2c522f80..a2373f078 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,12 @@ matrix:
     - os: linux
       env: HINTS=linux-x11
       compiler: gcc
+      addons:
+        apt:
+          packages:
+            - libx11-dev
+            - libxaw7-dev
+            - xfonts-utils
       script: "cd sys/unix/ && sh setup.sh hints/$HINTS && cd ../../ && make install"
     - os: linux
       env: HINTS=linux-qt5
@@ -19,6 +25,9 @@ matrix:
       addons:
         apt:
           packages:
+            - libx11-dev
+            - libxaw7-dev
+            - xfonts-utils
             - qtbase5-dev
             - qtmultimedia5-dev
             - qtbase5-dev-tools
diff --git a/doc/fixes36.3 b/doc/fixes36.3
index ea02fdf39..5f8b0815a 100644
--- a/doc/fixes36.3
+++ b/doc/fixes36.3
@@ -1,4 +1,4 @@
-$NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.102 $ $NHDT-Date: 1565574993 2019/08/12 01:56:33 $
+$NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.103 $ $NHDT-Date: 1565833748 2019/08/15 01:49:08 $
 
 This fixes36.3 file is here to capture information about updates in the 3.6.x
 lineage following the release of 3.6.2 in May 2019. Please note, however,
@@ -120,6 +120,11 @@ fix typo in end_of_input() present since 3.6.0 that would prevent compilation
 	for NOSAVEONHANGUP+INSURANCE configuration
 when a status condition becomes fatal, keep it listed as an active condition
 	during disclosure and/or dumplog rather than having it already reset
+when a shape-shifted sandestin was turned to stone, it died and reverted to
+	sandestin form with 0 HP; that confused known_hitum() because
+	sandestins are immune to stoning; net result was monster dying twice,
+	triggering "dmonsfree: N removed doesn't match N+1 pending" warning;
+	instead of dying, make it revert to sandestin form with full health
 
 
 Fixes to Post-3.6.2 Problems that Were Exposed Via git Repository
diff --git a/src/mon.c b/src/mon.c
index b04fb07c0..3c2278c5c 100644
--- a/src/mon.c
+++ b/src/mon.c
@@ -1,4 +1,4 @@
-/* NetHack 3.6	mon.c	$NHDT-Date: 1560791350 2019/06/17 17:09:10 $  $NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.294 $ */
+/* NetHack 3.6	mon.c	$NHDT-Date: 1565833749 2019/08/15 01:49:09 $  $NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.296 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Derek S. Ray, 2015. */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -1361,8 +1361,8 @@ long flag;
             thrudoor = TRUE;
     }
 
-nexttry: /* eels prefer the water, but if there is no water nearby,
-            they will crawl over land */
+ nexttry: /* eels prefer the water, but if there is no water nearby,
+             they will crawl over land */
     if (mon->mconf) {
         flag |= ALLOW_ALL;
         flag &= ~NOTONL;
@@ -2183,7 +2183,9 @@ struct monst *mdef;
     xchar x = mdef->mx, y = mdef->my;
     boolean wasinside = FALSE;
 
-    if (!vamp_stone(mdef)) /* vampshifter reverts to vampire */
+    /* vampshifter reverts to vampire;
+       3.6.3: also used to unshift shape-changed sandestin */
+    if (!vamp_stone(mdef))
         return;
 
     /* we have to make the statue before calling mondead, to be able to
@@ -2452,7 +2454,7 @@ int xkill_flags; /* 1: suppress message, 2: suppress corpse, 4: pacifist */
     /* monster is gone, corpse or other object might now be visible */
     newsym(x, y);
 
-cleanup:
+ cleanup:
     /* punish bad behaviour */
     if (is_human(mdat)
         && (!always_hostile(mdat) && mtmp->malign <= 0)
@@ -2586,6 +2588,18 @@ struct monst *mtmp;
             newsym(mtmp->mx, mtmp->my);
             return FALSE;   /* didn't petrify */
         }
+    } else if (mtmp->cham >= LOW_PM
+               && (mons[mtmp->cham].mresists & MR_STONE)) {
+        /* sandestins are stoning-immune so if hit by stoning damage
+           they revert to innate shape rather than become a statue */
+        mtmp->mcanmove = 1;
+        mtmp->mfrozen = 0;
+        if (mtmp->mhpmax <= 0)
+            mtmp->mhpmax = 10;
+        mtmp->mhp = mtmp->mhpmax;
+        (void) newcham(mtmp, &mons[mtmp->cham], FALSE, TRUE);
+        newsym(mtmp->mx, mtmp->my);
+        return FALSE;   /* didn't petrify */
     }
     return TRUE;
 }
@@ -2686,7 +2700,7 @@ struct monst *mon;
             mtmp->mstate |= MON_OBLITERATE;
             mongone(mtmp);
             /* places in the code might still reference mtmp->mx, mtmp->my */
-            /* mtmp->mx = mtmp->my = 0; */ 
+            /* mtmp->mx = mtmp->my = 0; */
             rloc_to(mon, mx, my);           /* note: mon, not mtmp */
 
         /* last resort - migrate mon to the next plane */