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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.
+
+<!--% # vim:set filetype=markdown textwidth=78 joinspaces: # %-->