brew install -vd r -> output

==> Build Environment
CC: /usr/bin/cc => /usr/bin/gcc-4.2
CXX: /usr/bin/c++ => /usr/bin/c++-4.2
LD: /usr/bin/cc => /usr/bin/gcc-4.2
CFLAGS: -O3 -march=core2 -w -pipe
CXXFLAGS: -O3 -march=core2 -w -pipe
MAKEFLAGS: -j4
==> Downloading http://cran.r-project.org/src/base/R-2/R-2.11.0.tar.gz
File already downloaded and cached to /Users/greg/Library/Caches/Homebrew
/usr/bin/tar xf /Users/greg/Library/Caches/Homebrew/r-2.11.0.tar.gz
Warning: No gfortran found in path
You'll need to `brew install gfortran` or otherwise have a copy
of gfortran in your path for this brew to work.
==> ./configure --prefix=/usr/local/Cellar/r/2.11.0
./configure --prefix=/usr/local/Cellar/r/2.11.0
checking build system type... x86_64-apple-darwin10.4.0
checking host system type... x86_64-apple-darwin10.4.0
loading site script './config.site'
loading build-specific script './config.site'
checking for pwd... /bin/pwd
checking whether builddir is srcdir... yes
checking for working aclocal... found
checking for working autoconf... found
checking for working automake... found
checking for working autoheader... found
checking for gawk... no
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checking for nawk... no
checking for awk... awk
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking whether ln -s works... yes
checking for bison... bison -y
checking for ar... ar
checking for a BSD-compatible install... /usr/bin/install -c
checking for sed... /usr/bin/sed
checking for tr... /usr/bin/tr
checking for less... /usr/bin/less
checking for perl... /usr/bin/perl
checking whether perl version is at least 5.8.0... yes
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checking for tar... /usr/bin/tar
checking for dvips... no
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configure: WARNING: you cannot build DVI versions of the R manuals
checking for latex... no
configure: WARNING: you cannot build DVI versions of all the help pages
checking for makeindex... no
checking for pdftex... no
configure: WARNING: you cannot build PDF versions of the R manuals
checking for pdflatex... no
configure: WARNING: you cannot build PDF versions of all the help pages
checking for makeinfo... /usr/bin/makeinfo
checking whether makeinfo version is at least 4.7... yes
checking for texi2dvi... /usr/bin/texi2dvi
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using default browser ... /usr/bin/open
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checking for open... /usr/bin/open
checking for pkg-config... /usr/local/bin/pkg-config
checking for gcc... /usr/bin/cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /usr/bin/cc accepts -g... yes
checking for /usr/bin/cc option to accept ISO C89... none needed
checking how to run the C preprocessor... /usr/bin/cc -E
checking whether /usr/bin/cc needs -traditional... no
checking how to run the C preprocessor... /usr/bin/cc -E
checking for gfortran... no
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checking for fc... fc
checking whether we are using the GNU Fortran 77 compiler... no
checking whether fc accepts -g... no
checking whether we are using the GNU C++ compiler... yes
checking whether /usr/bin/c++ accepts -g... yes
checking how to run the C++ preprocessor... /usr/bin/c++ -E
checking whether __attribute__((visibility())) is supported... no
checking whether /usr/bin/cc accepts -fvisibility... yes
checking whether fc accepts -fvisibility... no
checking for ANSI C header files... yes
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checking minix/config.h usability... no
checking minix/config.h presence... no
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checking whether it is safe to define __EXTENSIONS__... yes
checking for gcc... gcc
checking whether we are using the GNU Objective C compiler... yes
checking whether gcc accepts -g... yes
checking for Objective C++ compiler... trying some possibilities
checking whether /usr/bin/c++ can compile ObjC++... yes
/usr/bin/c++
checking for a sed that does not truncate output... (cached) /usr/bin/sed
checking for fgrep... /usr/bin/grep -F
checking for ld used by /usr/bin/cc... /usr/bin/cc
checking if the linker (/usr/bin/cc) is GNU ld... no
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm
checking the name lister (/usr/bin/nm) interface... BSD nm
checking the maximum length of command line arguments... 196608
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking for /usr/bin/cc option to reload object files... -r
checking for objdump... no
checking how to recognize dependent libraries... pass_all
checking for strip... strip
checking for ranlib... ranlib
checking command to parse /usr/bin/nm output from /usr/bin/cc object... ok
checking for dsymutil... dsymutil
checking for nmedit... nmedit
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checking for otool... otool
checking for otool64... no
checking for -single_module linker flag... yes
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checking whether we are using the GNU C++ compiler... (cached) yes
checking whether /usr/bin/c++ accepts -g... (cached) yes
checking how to run the C++ preprocessor... /usr/bin/c++ -E
checking whether we are using the GNU Fortran 77 compiler... (cached) no
checking whether fc accepts -g... (cached) no
checking for objdir... .libs
checking if /usr/bin/cc supports -fno-rtti -fno-exceptions... yes
checking for /usr/bin/cc option to produce PIC... -fno-common -DPIC
checking if /usr/bin/cc PIC flag -fno-common -DPIC works... yes
checking if /usr/bin/cc static flag -static works... no
checking if /usr/bin/cc supports -c -o file.o... yes
checking if /usr/bin/cc supports -c -o file.o... (cached) yes
checking whether the /usr/bin/cc linker (/usr/bin/cc) supports shared libraries... yes
checking dynamic linker characteristics... darwin10.4.0 dyld
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking for ld used by /usr/bin/c++... /usr/bin/cc
checking if the linker (/usr/bin/cc) is GNU ld... no
checking whether the /usr/bin/c++ linker (/usr/bin/cc) supports shared libraries... yes
checking for /usr/bin/c++ option to produce PIC... -fno-common -DPIC
checking if /usr/bin/c++ PIC flag -fno-common -DPIC works... yes
checking if /usr/bin/c++ static flag -static works... no
checking if /usr/bin/c++ supports -c -o file.o... yes
checking if /usr/bin/c++ supports -c -o file.o... (cached) yes
checking whether the /usr/bin/c++ linker (/usr/bin/cc) supports shared libraries... yes
checking dynamic linker characteristics... darwin10.4.0 dyld
checking how to hardcode library paths into programs... immediate
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking for fc option to produce PIC... 
checking if fc static flag  works... no
checking if fc supports -c -o file.o... no
checking if fc supports -c -o file.o... (cached) no
checking whether the fc linker (/usr/bin/cc) supports shared libraries... no
checking dynamic linker characteristics... darwin10.4.0 dyld
checking how to hardcode library paths into programs... immediate
checking for sin in -lm... yes
checking for library containing dlopen... none required
checking readline/history.h usability... yes
checking readline/history.h presence... yes
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checking readline/readline.h usability... yes
checking readline/readline.h presence... yes
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checking for rl_callback_read_char in -lreadline... yes
checking for history_truncate_file... yes
checking whether rl_completion_matches exists and is declared... yes
checking for ANSI C header files... (cached) yes
checking whether time.h and sys/time.h may both be included... yes
checking for dirent.h that defines DIR... yes
checking for library containing opendir... none required
checking for sys/wait.h that is POSIX.1 compatible... yes
checking arpa/inet.h usability... yes
checking arpa/inet.h presence... yes
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checking dl.h usability... no
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checking elf.h usability... no
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checking fcntl.h usability... yes
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checking netdb.h usability... yes
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checking time.h usability... yes
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checking errno.h usability... yes
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checking return type of signal handlers... void
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checking for type of socket length... socklen_t *
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checking for /usr/bin/cc option to accept ISO C99... -std=gnu99
checking for /usr/bin/cc -std=gnu99 option to accept ISO Standard C... (cached) -std=gnu99
checking for inline... inline
checking size of int... 4
checking size of long... 8
checking size of long long... 8
checking size of double... 8
checking size of long double... 16
checking size of size_t... 8
checking whether we can compute C Make dependencies... yes, using /usr/bin/cc -std=gnu99 -MM
checking whether /usr/bin/cc -std=gnu99 supports -c -o FILE.lo... yes
checking how to get verbose linking output from fc... configure: WARNING: compilation failed

checking for Fortran 77 libraries of fc... 
checking how to get verbose linking output from /usr/bin/cc -std=gnu99... -v
checking for C libraries of /usr/bin/cc -std=gnu99...  -lcrt1.10.6.o -L/usr/local/lib -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/x86_64 -L/usr/lib/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. -lSystem
checking for dummy main to link with Fortran 77 libraries... none
checking for Fortran 77 name-mangling scheme... configure: error: in `/private/tmp/homebrew-r-2.11.0-wpIk/R-2.11.0':
configure: error: cannot compile a simple Fortran program
See `config.log' for more details.
Error: #<BuildError: Failure while executing: ./configure --prefix=/usr/local/Cellar/r/2.11.0>
/usr/local/Library/Homebrew/formula.rb:340:in `system'
/usr/local/Library/Formula/r.rb:18:in `install'
/usr/local/Library/Homebrew/install.rb:97:in `install'
/usr/local/Library/Homebrew/formula.rb:202:in `brew'
/usr/local/Library/Homebrew/formula.rb:404:in `stage'
/usr/local/Library/Homebrew/formula.rb:360:in `mktemp'
/usr/local/Library/Homebrew/formula.rb:402:in `stage'
/usr/local/Library/Homebrew/formula.rb:197:in `brew'
/usr/local/Library/Homebrew/install.rb:74:in `install'
/usr/local/Library/Homebrew/install.rb:39
/usr/local/Library/Formula/r.rb:8
==> Rescuing build...
It looks like an autotools configure failed.
Gist 'config.log' and any error output when reporting an issue.

When you exit this shell Homebrew will attempt to finalise the installation.
If nothing is installed or the shell exits with a non-zero error code,
Homebrew will abort. The installation prefix is:
/usr/local/Cellar/r/2.11.0