You're using 4.0.1.201505042053-1-grsec, which is either an older version (although I don't see it in https://projects.archlinux.org/svntogit/community.git/log/trunk?h=packages/linux-grsec) or is not a kernel provided by Arch Linux. Update your system, reboot and try again.

got same error using Linux server.ourhome.net 4.0.4-2-ARCH #1 SMP PREEMPT Fri May 22 03:05:23 UTC 2015 x86_64 GNU/Linux
I've been able to build the entire archlinux base, dhcp, hostapd, dnsutils, .... without this problem. The only odd thing when I started trying to build bind was that it complained about libjson....I got past this by installing json-c package though I thought the base-developer group would have already installed the json dependencies.

the problem appears to be with the libjson incorporation. By default, bind enables libjson but this isn't listed as a dependency in the package. Unfortunately, I've tried using the json-c package to provide libjson but it causes other problems with ./configure.....
Can someone point me to a libjson package that they've been successfully building bind with????

it appears that the default bind configure requires libjson, which isn't listed as a dependency in the package. I added the json-c package to try to meet this dependency but it causes other problems with the ./configure. The only way I've been able to successfully build is with configure flag --with-libjson=no.

Build error without libjson
....
checking for json library... yes
checking for library containing json_object_new_int64... no
configure: error: found libjson include but not library.
==> ERROR: A failure occurred in build().

Build error with json-c package installed
...
checking for chroot... no
checking linux/types.h usability... no
checking linux/types.h presence... yes
configure: WARNING: linux/types.h: present but cannot be compiled
configure: WARNING: linux/types.h: check for missing prerequisite headers?
configure: WARNING: linux/types.h: see the Autoconf documentation
configure: WARNING: linux/types.h: section "Present But Cannot Be Compiled"
configure: WARNING: linux/types.h: proceeding with the compiler's result
configure: WARNING: ## --------------------------------- ##
configure: WARNING: ## Report this to bind9-bugs@isc.org ##
configure: WARNING: ## --------------------------------- ##
checking for linux/types.h... no
checking sys/capability.h usability... no
checking sys/capability.h presence... yes
configure: WARNING: sys/capability.h: present but cannot be compiled
configure: WARNING: sys/capability.h: check for missing prerequisite headers?
configure: WARNING: sys/capability.h: see the Autoconf documentation
configure: WARNING: sys/capability.h: section "Present But Cannot Be Compiled"
configure: WARNING: sys/capability.h: proceeding with the compiler's result
configure: WARNING: ## --------------------------------- ##
configure: WARNING: ## Report this to bind9-bugs@isc.org ##
configure: WARNING: ## --------------------------------- ##
checking for sys/capability.h... no
checking for linux/capability.h... yes
checking for cap_set_proc in -lcap... yes
checking sys/prctl.h usability... no
checking sys/prctl.h presence... yes
configure: WARNING: sys/prctl.h: present but cannot be compiled
configure: WARNING: sys/prctl.h: check for missing prerequisite headers?
configure: WARNING: sys/prctl.h: see the Autoconf documentation
configure: WARNING: sys/prctl.h: section "Present But Cannot Be Compiled"
configure: WARNING: sys/prctl.h: proceeding with the compiler's result
configure: WARNING: ## --------------------------------- ##
configure: WARNING: ## Report this to bind9-bugs@isc.org ##
configure: WARNING: ## --------------------------------- ##
checking for sys/prctl.h... no
checking sys/un.h usability... no
checking sys/un.h presence... yes
configure: WARNING: sys/un.h: present but cannot be compiled
configure: WARNING: sys/un.h: check for missing prerequisite headers?
configure: WARNING: sys/un.h: see the Autoconf documentation
configure: WARNING: sys/un.h: section "Present But Cannot Be Compiled"
configure: WARNING: sys/un.h: proceeding with the compiler's result
configure: WARNING: ## --------------------------------- ##
configure: WARNING: ## Report this to bind9-bugs@isc.org ##
configure: WARNING: ## --------------------------------- ##
checking for sys/un.h... no
checking for tzset... no
checking for optarg declaration... no
checking for type rlim_t... no
checking type of rlim_cur... configure: error: unable to determine sizeof rlim_cur
==> ERROR: A failure occurred in build().

Which libjson package are you building bind with?

Builds just fine here in a clean chroot. Probably something on your system causing the problem. Maybe it won't build against the grsec kernel? I don't get the warnings you get, either.

I thought it might be a grsec kernel problem also but get same problem with regular kernel.