+ since otherwise we get redefinitions on some systems if <limits.h> is
+ included after this file. Likewise for <sys/param.h>.
+ If more than one of these system headers define MIN and MAX, pick just
+ one of the headers (because the definitions most likely are the same). */
+#if HAVE_MINMAX_IN_LIMITS_H
+# include <limits.h>
+#elif HAVE_MINMAX_IN_SYS_PARAM_H
+# include <sys/param.h>
+#endif