openbsd-amd64-head (OpenBSD/amd64 HEAD (Roland Zumkeller)), build 64, Failure

[Builder]

openbsd-amd64-head (OpenBSD/amd64 HEAD (Roland Zumkeller)), build 64

Build failed
Details: http://haskell.inf.elte.hu/builders/openbsd-amd64-head/64.html

git clone                    | Success
create mk/build.mk           | Success
get subrepos                 | Success
repo versions                | Success
touching clean-check files   | Success
setting version date         | Success
booting                      | Success
configuring                  | Success
creating check-remove-before | Success
compiling                    | Failure: Just (ExitFailure 2)

Build failed
Details: http://haskell.inf.elte.hu/builders/openbsd-amd64-head/64.html

-------------- next part --------------
checking value of SIGXFSZ... 25
checking value of SIG_BLOCK... 1
checking value of SIG_SETMASK... 3
checking value of SIG_UNBLOCK... 2
checking for _SC_GETGR_R_SIZE_MAX... yes
checking for _SC_GETPW_R_SIZE_MAX... yes
checking return type of usleep... int
checking return type of unsetenv... int
checking for RTLD_NEXT from dlfcn.h... yes
checking for RTLD_DEFAULT from dlfcn.h... yes
checking for openpty... no
checking for openpty in -lutil... yes
checking for /dev/ptmx... no
checking for /dev/ptc... no
checking for dlopen in -ldl... no
checking build system type... x86_64-unknown-openbsd5.5
checking host system type... x86_64-unknown-openbsd5.5
checking target system type... x86_64-unknown-openbsd5.5
checking for library containing sem_close... -lpthread
configure: creating ./config.status
config.status: creating unix.buildinfo
config.status: creating include/HsUnixConfig.h
configure: WARNING: unrecognized options: --with-compiler, --with-iconv-includes, --with-iconv-libraries, --with-gmp-includes, --with-gmp-libraries, --with-gcc
ghc-cabal: Bad header file: execvpe.h
The header file contains a compile error. You can re-run configure with the
verbosity flag -v3 to see the error messages from the C compiler.
libraries/unix/ghc.mk:4: recipe for target 'libraries/unix/dist-install/package-data.mk' failed
gmake[1]: *** [libraries/unix/dist-install/package-data.mk] Error 1
Makefile:71: recipe for target 'all' failed
gmake: *** [all] Error 2