switch to weak aliases so it at least compiles on Mac OS X; note that the aliases do not actually work, so there is no cucul binary compatiblity in fact

caca/caca.h

@@ -473,12 +473,13 @@ typedef struct cucul_buffer cucul_buffer_t;
 
 #   if defined __GNUC__ && __GNUC__ >= 3
 #       define CACA_DEPRECATED __attribute__ ((__deprecated__))
-#       define CACA_ALIAS(x) __attribute__ ((alias(#x)))
+#       define CACA_ALIAS(x) __attribute__ ((weak, alias(#x)))
 #   else
 #       define CACA_DEPRECATED
 #       define CACA_ALIAS(x)
 #   endif
 
+
 /* Aliases from old libcucul functions */
 __extern int cucul_putchar(caca_canvas_t *, int, int,
                            unsigned long int) CACA_DEPRECATED;