Can't get Octave to install (gfortran dependency)

[romeovs]

I keep getting the following error:

romeovs:~ » brew install --use-clang octave
==> Installing octave dependency: dotwrp
==> Cloning https://github.com/tenomoto/dotwrp.git
Updating /Users/romeovs/Library/Caches/Homebrew/dotwrp--git
Error: This formula requires a fortran compiler, but we could not find one by
looking at the FC environment variable or searching your PATH for `gfortran`.
Please take one of the following actions:

  - Decide to use the build of gfortran 4.2.x provided by Homebrew using
        `brew install gfortran`

  - Choose another Fortran compiler by setting the FC environment variable:
     export FC=/path/to/some/fortran/compiler
    Using an alternative compiler may produce more efficient code, but we will
    not be able to provide support for build errors.

Even after I tried brew install gfortran. Mybrew doctor output is:

romeovs:~ » brew doctor
Your system is raring to brew.

The strange thing this is that which gfortran gives me nothing wile man gfortran does print the fortan man page. mdfind gfortran delivers:

...
/usr/local/Cellar/gfortran/4.2.4-5666.3/share/man/man1/gfortran-4.2.1
/usr/local/Cellar/gfortran/4.2.4-5666.3/bin/i686-apple-darwin11-gfortran-4.2.1
/usr/local/Cellar/gfortran/4.2.4-5666.3/bin/gfortran-4.2
/usr/local/Cellar/gfortran
...

so if I do export FC = /usr/local/Cellar/gfortran/4.2.4-5666.3/bin/i686-apple-darwin11-gfortran-4.2.1 I can procede with brew install octave yet I get the following error:

 brew install octave                                                            (12-08 17:17)
==> Installing octave dependency: dotwrp
==> Cloning https://github.com/tenomoto/dotwrp.git
Updating /Users/romeovs/Library/Caches/Homebrew/dotwrp--git
==> Building with an alternative Fortran compiler. This is unsupported.
Warning: No Fortran optimization information was provided.  You may want to consider
setting FCFLAGS and FFLAGS or pass the `--default-fortran-flags` option to
`brew install` if your compiler is compatible with GCC.

If you like the default optimization level of your compiler, ignore this 
warning.
==> /usr/local/Cellar/gfortran/4.2.4-5666.3/bin/i686-apple-darwin11-gfortran-4.2.1  -fno-underscoring -c 
==> /usr/bin/ar -cru libdotwrp.a dotwrp.o
==> /usr/bin/ranlib libdotwrp.a
/usr/local/Cellar/dotwrp/1.0: 3 files, 12K, built in 2 seconds
==> Installing octave dependency: qrupdate
==> Downloading http://downloads.sourceforge.net/qrupdate/qrupdate-1.1.1.tar.gz
######################################################################## 100.0%
==> Building with an alternative Fortran compiler. This is unsupported.
Warning: No Fortran optimization information was provided.  You may want to consider
setting FCFLAGS and FFLAGS or pass the `--default-fortran-flags` option to
`brew install` if your compiler is compatible with GCC.

If you like the default optimization level of your compiler, ignore this 
warning.
==> make -j 1 install
/usr/local/bin/gfortran -O3 -march=core2 -w -pipe -fPIC -c caxcpy.f
make: /usr/local/bin/gfortran: No such file or directory 
make: *** [caxcpy.o] Error 1
==> Exit Status: 2
http://github.com/mxcl/homebrew/blob/master/Library/Formula/qrupdate.rb#L25
==> Environment
HOMEBREW_VERSION: 0.8
HEAD: 4cc61cb31ef1b3dec1974f98cd20322fefb31732
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_LIBRARY_PATH: /usr/local/Library/Homebrew
Hardware: quad-core 64-bit sandybridge
OS X: 10.7.2
Kernel Architecture: x86_64
Ruby: 1.8.7-249
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Xcode: 4.2.1
GCC-4.0: N/A
GCC-4.2: build 5666
LLVM: build 2336
Clang: 3.0-211.1
MacPorts or Fink? false
X11 installed? true
==> Build Flags
CC: /usr/bin/llvm-gcc => /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2
CXX: /usr/bin/llvm-g++ => /usr/llvm-gcc-4.2/bin/llvm-g++-4.2
LD: /usr/bin/llvm-gcc => /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2
CFLAGS: -O3 -march=core2 -w -pipe 
CXXFLAGS: -O3 -march=core2 -w -pipe
MAKEFLAGS: -j4

Error: Failed executing: make -j 1 install 

Same thing for export FC = /usr/local/Cellar/gfortran/4.2.4-5666.3/bin/gfortran-4.2.

I'm in the dark here (I'm not a computer genius).

[walchko]

I have the same issue! I installed gfortran, but Octave refuses to install.

[walchko]

ok ... I created the environment variable:

export FC=/usr/local/bin/gfortran-4.2

Next, qruptdate is looking for gfortran so I made a symbolic link from gfortran-4.2 binary

ln -s /usr/local/bin/gfortran-4.2 /usr/local/bin/gfortran

That seems to have fixed it. I would suggest gfortran formula telling users to update env and create a symbolic link

[Sharpie]

The GFortran formula does create a symbolic link from gfortran-4.2 -> gfortran. If which gfortran is returning empty after brew install gfortran, then then installation is incomplete for some reason.

Try re-installing GFortran. If you get the same problem, post the results of brew install -v gfortran so we can see if the links are getting created properly.

[eager]

I can confirm this issue, with the latest Xcode installed on 10.7.2.

brew --config says GCC-4.2 is build 5666, which means the Lion install logic is pre-empted by the Xcode 3.26--4.1 conditional. I would guess the cause of confusion is that /usr/bin/gcc symlinks to llvm-gcc-4.2, build 5658. /usr/bin/gcc-4.2, which is the path brew uses to determine gcc_42_build, is still 5666.

[Sharpie]

Allright, this should be fixed. The problem was appearing for users who upgraded from XCode 4.1 or earlier as they will still have gcc-4.2 binaries hanging around and this was confusing the installation logic which incorrectly assumed that any user with 4.2 has no vanilla GCC.