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--- Xfoil/src/xoper.f.orig	2013-12-08 22:21:22.000000000 +0400
+++ Xfoil/src/xoper.f	2017-03-05 23:02:33.214895357 +0300
@@ -114,7 +114,7 @@
 C---- don't try to read integers, since might get integer overflow
       DO I=1, NINPUT
         IF(ABS(RINPUT(I)) .GT. 2.1E9) THEN
-         IINPUT(I) = 2**30
+         IINPUT(I) = HUGE(0)
         ELSE
          IINPUT(I) = INT(RINPUT(I))
         ENDIF