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title: Configure hangs
parent: FAQ
---
# The configure script appears to hang
If you find that the configure script appears to hang on this line:
checking for redhat spopen problem...
Then you probably have a badly configured DNS server. This part of configure
is testing for a pthread problem in BIND that is a kernel problem on some Red
Hat derived versions of Linux (around kernel 2.6.9-11). It runs 10 x 100
nslookup calls to see if your kernel has this problem. If it does, then at
least one of those calls will fail. Failure rate could be anywhere between 1%
and 50%.
To force the workaround and ignore the test, run `./configure` with the
`--enable-redhat-pthread-workaround` switch.
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