validator3-osx-x86_64-head (OS X/x86_64 HEAD (Jonathan Boyett)), build 1, Failure

[Builder]

validator3-osx-x86_64-head (OS X/x86_64 HEAD (Jonathan Boyett)), build 1

Build failed
Details: http://haskell.inf.elte.hu/builders/validator3-osx-x86_64-head/1.html

git clone                    | Success
git clone (Windows tarballs) | Success
create mk/build.mk           | Success
repo versions                | Success
booting                      | Success
configuring                  | Success
compiling                    | Success
making bindist               | Failure: Just (ExitFailure 2)

Build failed
Details: http://haskell.inf.elte.hu/builders/validator3-osx-x86_64-head/1.html

-------------- next part --------------
for f in iserv/stage2_p/package-data.mk; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in iserv/stage2_p/build/.depend.haskell; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in iserv/stage2_p/build/.depend.c_asm; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in iserv/stage2_dyn/package-data.mk; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in iserv/stage2_dyn/build/.depend.haskell; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in iserv/stage2_dyn/build/.depend.c_asm; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in mk/project.mk; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in mk/install.mk.in; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in bindist.mk; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in libraries/gen_contents_index; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in libraries/prologue.txt; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in libraries/dph/LICENSE; do echo ghc-8.1.20160218/$f >> bindist-list; done    
for f in libraries/dph/ghc-packages; do echo ghc-8.1.20160218/$f >> bindist-list; done  
/Applications/Xcode.app/Contents/Developer/usr/bin/make --no-print-directory -f ghc.mk unix-binary-dist-prep
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
"rm" -rf bindistprep/  
"inplace/bin/mkdirhier" bindistprep/ghc-8.1.20160218
set -e; for i in packages LICENSE compiler ghc iserv rts libraries utils docs libffi includes driver mk rules Makefile aclocal.m4 config.sub config.guess install-sh settings.in ghc.mk inplace distrib/configure.ac distrib/README distrib/INSTALL; do ln -s ../../$i bindistprep/ghc-8.1.20160218/; done
echo "HADDOCK_DOCS       = YES"       >> bindistprep/ghc-8.1.20160218/bindist.mk
echo "BUILD_SPHINX_HTML  = YES"  >> bindistprep/ghc-8.1.20160218/bindist.mk
echo "BUILD_SPHINX_PDF   = NO"   >> bindistprep/ghc-8.1.20160218/bindist.mk
echo "BUILD_MAN          = YES"          >> bindistprep/ghc-8.1.20160218/bindist.mk
echo "override ghc-cabal_INPLACE = utils/ghc-cabal/dist-install/build/tmp/ghc-cabal-bindist" >> bindistprep/ghc-8.1.20160218/bindist.mk
echo "UseSystemLibFFI    = NO"    >> bindistprep/ghc-8.1.20160218/bindist.mk
cd bindistprep/ghc-8.1.20160218 && autoreconf
"rm" -f bindistprep/ghc-8.1.20160218-x86_64-apple-darwin.tar  
cd bindistprep && "/usr/bin/tar" hcf - -T ../bindist-list | xz -c > ../bindistprep/ghc-8.1.20160218-x86_64-apple-darwin.tar.xz
/bin/sh: xz: command not found
make[1]: *** [unix-binary-dist-prep] Error 127
make: *** [binary-dist-prep] Error 2