Output of configure when building GCC 4.9.0 on OS X 10.9.3 (with coreutils installed from MacPorts, see https://gist.github.com/ZhimingWang/b76e6168d88031b6f4f9).

configure_output

checking build system type... x86_64-apple-darwin13.2.0
checking host system type... x86_64-apple-darwin13.2.0
checking target system type... x86_64-apple-darwin13.2.0
checking for a BSD-compatible install... /opt/local/libexec/gnubin//install -c
checking whether ln works... yes
checking whether ln -s works... yes
checking for a sed that does not truncate output... /opt/local/libexec/gnubin//sed
checking for gawk... gawk
checking for libatomic support... yes
checking for libcilkrts support... yes
checking for libitm support... yes
checking for libsanitizer support... yes
checking for libvtv support... no
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking whether g++ accepts -static-libstdc++ -static-libgcc... no
checking for gnatbind... no
checking for gnatmake... no
checking whether compiler driver understands Ada... no
checking how to compare bootstrapped objects... cmp --ignore-initial=16 $$f1 $$f2
checking for objdir... .libs
checking for default BUILD_CONFIG... bootstrap-debug
checking for --enable-vtable-verify... no
checking for bison... bison -y
checking for bison... bison
checking for gm4... gm4
checking for flex... flex
checking for flex... flex
checking for makeinfo... makeinfo
checking for expect... expect
checking for runtest... no
checking for ar... ar
checking for as... as
checking for dlltool... no
checking for ld... (cached) /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld
checking for lipo... lipo
checking for nm... nm
checking for ranlib... ranlib
checking for strip... strip
checking for windres... no
checking for windmc... no
checking for objcopy... no
checking for objdump... no
checking for readelf... no
checking for cc... cc
checking for c++... c++
checking for gcc... gcc
checking for gcj... no
checking for gfortran... no
checking for gccgo... no
checking for ar... no
checking for ar... ar
checking for as... no
checking for as... as
checking for dlltool... no
checking for dlltool... no
checking for ld... no
checking for ld... ld
checking for lipo... no
checking for lipo... lipo
checking for nm... no
checking for nm... nm
checking for objdump... no
checking for objdump... no
checking for ranlib... no
checking for ranlib... ranlib
checking for readelf... no
checking for readelf... no
checking for strip... no
checking for strip... strip
checking for windres... no
checking for windres... no
checking for windmc... no
checking for windmc... no
checking where to find the target ar... host tool
checking where to find the target as... host tool
checking where to find the target cc... just compiled
checking where to find the target c++... just compiled
checking where to find the target c++ for libstdc++... just compiled
checking where to find the target dlltool... host tool
checking where to find the target gcc... just compiled
checking where to find the target gcj... host tool
checking where to find the target gfortran... host tool
checking where to find the target gccgo... host tool
checking where to find the target ld... host tool
checking where to find the target lipo... host tool
checking where to find the target nm... host tool
checking where to find the target objdump... host tool
checking where to find the target ranlib... host tool
checking where to find the target readelf... host tool
checking where to find the target strip... host tool
checking where to find the target windres... host tool
checking where to find the target windmc... host tool
checking whether to enable maintainer-specific portions of Makefiles... no
configure: creating ./config.status
config.status: creating Makefile