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diff -durN tecnoballz-0.92/include/tiles_background.h tecnoballz-0.92.gcc6/include/tiles_background.h
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--- tecnoballz-0.92/include/tiles_background.h	2007-09-25 07:43:20.000000000 +0200
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+++ tecnoballz-0.92.gcc6/include/tiles_background.h	2016-03-26 17:59:30.283777384 +0100
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@@ -47,7 +47,7 @@
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     static tiles_background* tiles_background_singleton;
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     static Sint32 table_pos1[16];
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     static Sint32 table_pos2[16];
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-    static char couleurs[448];
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+    static unsigned char couleurs[448];
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     static const Sint32 TILES_32_WIDTH = 32;
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     static const Sint32 TILES_32_HEIGHT = 32;
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     static const Sint32 TILES_64_WIDTH = 64;
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diff -durN tecnoballz-0.92/src/tiles_background.cc tecnoballz-0.92.gcc6/src/tiles_background.cc
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--- tecnoballz-0.92/src/tiles_background.cc	2007-09-25 07:43:20.000000000 +0200
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+++ tecnoballz-0.92.gcc6/src/tiles_background.cc	2016-03-26 18:41:12.767764934 +0100
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@@ -663,7 +663,7 @@
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     }
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   palette_index = pal_index;
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-  char *color = &couleurs[0];
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+  unsigned char *color = &couleurs[0];
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   unsigned char *colPT = (unsigned char *) (color) + pal_index;
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   SDL_Color *pal = display->get_palette ();
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   SDL_Color *lighted = pal + 1;
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@@ -702,7 +702,7 @@
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  * 4 * 4    : 16 composantes by palette
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  * 112 * 4  : 448 composantes
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 */
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-char
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+unsigned char
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 tiles_background::couleurs[448] = {
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                                     0x00, 0x40, 0x20, 0x40, 0x00, 0x60, 0x40, 0x60, 0x00, 0x80, 0x60, 0x80,
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                                     0x00, 0xA0, 0x80, 0xA0, 0x00, 0x00, 0x20, 0x40, 0x00, 0x20,