diff --git a/src/Makefile b/src/Makefile
index 355b8daa..6c686c2d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -453,6 +453,10 @@ ifdef ZDEBUG
 	CPPFLAGS+=-DZDEBUG
 endif
 
+ifdef DEVELOP
+	CPPFLAGS+=-DDEVELOP
+endif
+
 OPTS+=$(CPPFLAGS)
 
 # default EXENAME if all else fails
diff --git a/src/k_kart.c b/src/k_kart.c
index 28a566c9..9de1343c 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -2813,7 +2813,7 @@ void K_DriftDustHandling(mobj_t *spawner)
 	{
 		if (spawner->player->pflags & PF_SKIDDOWN)
 		{
-			anglediff = abs(spawner->angle - spawner->player->frameangle);
+			anglediff = abs((signed)(spawner->angle - spawner->player->frameangle));
 			if (leveltime % 6 == 0)
 				S_StartSound(spawner, sfx_screec); // repeated here because it doesn't always happen to be within the range when this is the case
 		}
@@ -2827,7 +2827,7 @@ void K_DriftDustHandling(mobj_t *spawner)
 			if (spawner->player->cmd.forwardmove < 0)
 				playerangle += ANGLE_180;
 
-			anglediff = abs(playerangle - R_PointToAngle2(0, 0, spawner->player->rmomx, spawner->player->rmomy));
+			anglediff = abs((signed)(playerangle - R_PointToAngle2(0, 0, spawner->player->rmomx, spawner->player->rmomy)));
 		}
 	}
 	else
@@ -2835,7 +2835,7 @@ void K_DriftDustHandling(mobj_t *spawner)
 		if (P_AproxDistance(spawner->momx, spawner->momy) < 5<<FRACBITS)
 			return;
 
-		anglediff = abs(spawner->angle - R_PointToAngle2(0, 0, spawner->momx, spawner->momy));
+		anglediff = abs((signed)(spawner->angle - R_PointToAngle2(0, 0, spawner->momx, spawner->momy)));
 	}
 
 	if (anglediff > ANGLE_180)
@@ -7916,7 +7916,7 @@ static void K_drawLapStartAnim(void)
 	{
 		V_DrawFixedPatch((BASEVIDWIDTH/2 + (32*max(0, stplyr->kartstuff[k_lapanimation]-76)))*FRACUNIT,
 			(48 - (32*max(0, progress-76))
-				+ 4 - abs((leveltime % 8) - 4))*FRACUNIT,
+				+ 4 - abs((signed)((leveltime % 8) - 4)))*FRACUNIT,
 			FRACUNIT, V_SNAPTOTOP|V_HUDTRANS,
 			kp_lapanim_hand[stplyr->kartstuff[k_laphand]-1], NULL);
 	}
diff --git a/src/p_user.c b/src/p_user.c
index 1a6c2e3b..5f12a3ce 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -6697,7 +6697,7 @@ static void P_MovePlayer(player_t *player)
 		if (player->mo->state != &states[S_KART_SPIN])
 			P_SetPlayerMobjState(player->mo, S_KART_SPIN);
 
-		if (speed == 1 && abs(player->mo->angle - player->frameangle) < ANGLE_22h)
+		if (speed == 1 && abs((signed)(player->mo->angle - player->frameangle)) < ANGLE_22h)
 			player->frameangle = player->mo->angle; // Face forward at the end of the animation
 		else
 			player->frameangle -= (ANGLE_11hh * speed);