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-rw-r--r--README_d/README.ultrix7
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diff --git a/README_d/README.ultrix b/README_d/README.ultrix
index 9c56c250..4943409c 100644
--- a/README_d/README.ultrix
+++ b/README_d/README.ultrix
@@ -18,3 +18,10 @@ these paragraphs to it:
does the job. Without the switch gawk will compile and run correctly,
but you will get complaints about lost optimisations in builtin.c,
awk.tab.c and regex.c.
+
+From: Arnold Robbins <arnold@math.utah.edu>
+Date: Sun Sep 8 07:05:07 EDT 1996
+
+On Decstations using Ultrix 4.3, the tweakfld test case will fail. It
+appears that routines in the math library return very small but non-zero
+numbers in cases where most other systems return zero.