diff --git a/polymer/eduke32/Makefile.common b/polymer/eduke32/Makefile.common
index 69d1e4800..133c96833 100644
--- a/polymer/eduke32/Makefile.common
+++ b/polymer/eduke32/Makefile.common
@@ -178,6 +178,12 @@ DMALLOC?=0
 PROFILER?=0
 MUDFLAP?=0
 
+# Make allocache() a wrapper around malloc()? Useful for debugging
+# allocache()-allocated memory accesses with e.g. Valgrind.
+# For debugging with Valgrind + GDB, see
+# http://valgrind.org/docs/manual/manual-core-adv.html#manual-core-adv.gdbserver
+ALLOCACHE_AS_MALLOC?=0
+
 # Select the default optimization level for release and debug builds.
 ifeq ($(RELEASE),0)
     OPTLEVEL?=0
@@ -343,6 +349,10 @@ endif
 
 debug+= -O$(OPTLEVEL)
 
+ifneq ($(ALLOCACHE_AS_MALLOC),0)
+    debug+= -DDEBUG_ALLOCACHE_AS_MALLOC
+endif
+
 # See http://clang.llvm.org/docs/UsersManual.html#controlling-code-generation
 # for a list of possible UBSan options.
 # Clang 3.2 does only supports -fsanitize=address for the AddressSanitizer
diff --git a/polymer/eduke32/build/src/a-c.c b/polymer/eduke32/build/src/a-c.c
index 14b4cda62..ef8213654 100644
--- a/polymer/eduke32/build/src/a-c.c
+++ b/polymer/eduke32/build/src/a-c.c
@@ -8,15 +8,6 @@
 
 #include "a.h"
 
-// For this, it's also sensible to uncomment DEBUG_ALLOCACHE_AS_MALLOC:
-//#define DEBUG_WITH_VALGRIND
-
-#ifdef DEBUG_WITH_VALGRIND
-// For debugging with Valgrind + GDB, see
-// http://valgrind.org/docs/manual/manual-core-adv.html#manual-core-adv.gdbserver
-# include <valgrind/memcheck.h>
-#endif
-
 #ifdef ENGINE_USING_A_C
 
 int32_t krecip(int32_t num);	// from engine.c
@@ -131,19 +122,9 @@ static inline uint32_t ourmulscale32(uint32_t a, uint32_t b)
 static inline int32_t getpix(int32_t logy, const char *buf, uint32_t vplc)
 {
     if (logy != 0)
-    {
-#ifdef DEBUG_WITH_VALGRIND
-        VALGRIND_CHECK_MEM_IS_DEFINED(&buf[vplc>>logy], 1);
-#endif
         return buf[vplc>>logy];
-    }
     else
-    {
-#ifdef DEBUG_WITH_VALGRIND
-        VALGRIND_CHECK_MEM_IS_DEFINED(&buf[ourmulscale32(vplc,globaltilesizy)], 1);
-#endif
         return buf[ourmulscale32(vplc,globaltilesizy)];
-    }
 }
 
 void setupvlineasm(int32_t neglogy) { glogy = neglogy; }
diff --git a/polymer/eduke32/build/src/cache1d.c b/polymer/eduke32/build/src/cache1d.c
index bc9a1598a..d4892e868 100644
--- a/polymer/eduke32/build/src/cache1d.c
+++ b/polymer/eduke32/build/src/cache1d.c
@@ -83,10 +83,6 @@ static intptr_t kzipopen(const char *filnam)
 //           After calling uninitcache, it is still ok to call allocache
 //           without first calling initcache.
 
-// Uncomment for easier allocache-allocated bound checking (e.g. with Valgrind)
-// KEEPINSYNC game.c
-//#define DEBUG_ALLOCACHE_AS_MALLOC
-
 #define MAXCACHEOBJECTS 9216
 
 #if !defined DEBUG_ALLOCACHE_AS_MALLOC
diff --git a/polymer/eduke32/source/game.c b/polymer/eduke32/source/game.c
index ab3547bff..a958de23d 100644
--- a/polymer/eduke32/source/game.c
+++ b/polymer/eduke32/source/game.c
@@ -1371,10 +1371,6 @@ void G_GameQuit(void)
         G_GameExit("Timed out.");
 }
 
-// Uncomment for easier allocache-allocated bound checking (e.g. with Valgrind)
-// KEEPINSYNC cache1d.c
-//#define DEBUG_ALLOCACHE_AS_MALLOC
-
 #if !defined DEBUG_ALLOCACHE_AS_MALLOC
 extern int32_t cacnum;
 extern cactype cac[];
diff --git a/polymer/eduke32/source/valgrind_errors.log b/polymer/eduke32/source/valgrind_errors.log
index b8d7ec013..50055535f 100644
--- a/polymer/eduke32/source/valgrind_errors.log
+++ b/polymer/eduke32/source/valgrind_errors.log
@@ -1,8 +1,10 @@
-build: LTO=0 WITHOUT_GTK=1 RELEASE=0 LUNATIC=0 make
+build: ALLOCACHE_AS_MALLOC=1 LTO=0 WITHOUT_GTK=1 RELEASE=0 LUNATIC=0 make
 platform: Linux/x86_64
 
 ----------
 
+See the comment in MV_Init().
+
 Thread 3:
 Invalid read of size 2
    at 0x8730513: MV_Mix16BitStereo16Stereo (mixst.c:272)
@@ -134,3 +136,29 @@ Invalid read of size 1
    by 0x507589: M32_DrawRoomsAndMasks (build.c:479)
    by 0x507F69: app_main (build.c:742)
    by 0x502328: main (sdlayer.c:278)
+
+----------
+
+BLiGHT: strafing (tilts the screen).
+
+Invalid read of size 1
+   at 0x5BE3A6: vlineasm4 (a-c.c:125)
+   by 0x532C3E: wallscan (engine.c:3905)
+   by 0x5356CB: parascan (engine.c:4607)
+   by 0x536288: drawalls (engine.c:4853)
+   by 0x5449BF: drawrooms (engine.c:9052)
+   by 0x529FAA: yax_drawrooms (engine.c:1174)
+   by 0x43C627: G_DrawRooms (game.c:4650)
+   by 0x45426D: app_main (game.c:12014)
+   by 0x5BA9A5: main (sdlayer.c:278)
+ Address 0x26c8a44a is 10 bytes after a block of size 128,000 alloc'd
+   at 0x11C852DB: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
+   by 0x51D524: allocache (cache1d.c:160)
+   by 0x54D0B2: loadtile (engine.c:11521)
+   by 0x4F3BF4: G_CacheMapData (premap.c:487)
+   by 0x4F930A: G_EnterLevel (premap.c:1910)
+   by 0x4BC269: G_NewGame_EnterLevel (game.h:553)
+   by 0x4C5364: M_DisplayMenus (menus.c:2442)
+   by 0x486A91: G_PlaybackDemo (demo.c:936)
+   by 0x453A46: app_main (game.c:11844)
+   by 0x5BA9A5: main (sdlayer.c:278)