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Reviewed over jabber by Evan.
committing with no CHANGES note 

committing to 
9.9.12, 9.10.7, 9.11.3, 9.12.0

On Thu Aug 03 23:06:36 2017, ckb wrote:
> configuring on openbsd gives the following:
> 
> checking pthread_np.h presence... yes
> configure: WARNING: pthread_np.h: present but cannot be compiled
> configure: WARNING: pthread_np.h:     check for missing prerequisite
> headers?
> configure: WARNING: pthread_np.h: see the Autoconf documentation
> configure: WARNING: pthread_np.h:     section "Present But Cannot Be
> Compiled"
> configure: WARNING: pthread_np.h: proceeding with the compiler's
> result
> configure: WARNING:     ## --------------------------------- ##
> configure: WARNING:     ## Report this to bind9-bugs@isc.org ##
> configure: WARNING:     ## --------------------------------- ##
> checking for pthread_np.h... no
> 
> this is because the file does not include pthread.h, so the test for
> it fails.
> 
> the following patch fixes it:
> 
> diff --git a/configure.in b/configure.in
> index 737b1c1..059189b 100644
> --- a/configure.in
> +++ b/configure.in
> @@ -1353,7 +1353,7 @@ then
> 
> # Look for functions relating to thread naming
> AC_CHECK_FUNCS(pthread_setname_np pthread_set_name_np)
> -       AC_CHECK_HEADERS(pthread_np.h)
> +       AC_CHECK_HEADERS([pthread_np.h], [], [], [#include
> <pthread.h>])
> 
> #
> # Look for sysconf to allow detection of the number of processors.