+echo $ac_n "checking for long long ... $ac_c"
+AC_TRY_RUN([#include <stdio.h>
+main() { long long x = 1000000; x *= x; exit(((x/1000000) == 1000000)? 0: 1); }],
+echo yes;AC_DEFINE(HAVE_LONGLONG),
+echo no)
+
+echo $ac_n "checking for off64_t ... $ac_c"
+AC_TRY_RUN([#include <stdio.h>
+#include <sys/stat.h>
+main() { struct stat64 st; off64_t s; exit((lstat64("/dev/null", &st)==0)?0:1); }],
+echo yes;AC_DEFINE(HAVE_OFF64_T),
+echo no)
+
+echo $ac_n "checking for unsigned char ... $ac_c"
+AC_TRY_RUN([#include <stdio.h>
+main() { char c; c=250; exit((c > 0)?0:1); }],
+echo yes;AC_DEFINE(HAVE_UNSIGNED_CHAR),
+echo no)
+