checking whether ld understands --build-id... no
checking whether ld understands -no_compact_unwind... no
checking whether ld understands -filelist... no
checking Setting up CFLAGS, LDFLAGS, IGNORE_LINKER_LD_FLAGS and CPPFLAGS... done
checking Setting up CONF_CC_OPTS_STAGE0, CONF_GCC_LINKER_OPTS_STAGE0, CONF_LD_LINKER_OPTS_STAGE0 and CONF_CPP_OPTS_STAGE0... done
checking Setting up CONF_CC_OPTS_STAGE1, CONF_GCC_LINKER_OPTS_STAGE1, CONF_LD_LINKER_OPTS_STAGE1 and CONF_CPP_OPTS_STAGE1... done
checking Setting up CONF_CC_OPTS_STAGE2, CONF_GCC_LINKER_OPTS_STAGE2, CONF_LD_LINKER_OPTS_STAGE2 and CONF_CPP_OPTS_STAGE2... done
checking for extra options to pass gcc when compiling via C...  -fwrapv
checking for .subsections_via_symbols... no
checking whether your assembler supports .ident directive... yes
checking for GNU non-executable stack support... yes
checking for a working context diff... diff -U 1
checking for a BSD-compatible install... /usr/bin/ginstall -c
checking for ar... /usr/xpg4/bin/ar
checking whether /usr/xpg4/bin/ar is GNU ar... no
checking for ar arguments... clqs
checking whether /usr/xpg4/bin/ar supports @file... no
checking for ranlib... /usr/bin/ranlib
checking whether ln -s works... yes
checking for gsed... no
checking for sed... /usr/xpg4/bin/sed
checking for time... /usr/bin/time
checking for gnutar... no
checking for gtar... /usr/bin/gtar
checking for gpatch... /usr/bin/gpatch
checking for dtrace... /sbin/dtrace
checking for HsColour... no
checking for sphinx-build... no
checking for version of sphinx-build... 
configure: error: Sphinx version 1.0.0 or later is required to build documentation