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-rw-r--r--hints/ultrix_4.sh4
1 files changed, 4 insertions, 0 deletions
diff --git a/hints/ultrix_4.sh b/hints/ultrix_4.sh
index d8d2063b22..ed9fe5b9ed 100644
--- a/hints/ultrix_4.sh
+++ b/hints/ultrix_4.sh
@@ -64,3 +64,7 @@ groupstype='int'
# configure test should be beefed up to try using the field when
# it can't find any of the standardly-named fields.
d_dirnamlen='define'
+
+# Ultrix can mmap only character devices, not regular files,
+# which is rather useless state of things for Perl.
+d_mmap='undef'