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I'm trying to install a package in R (package "ks"). It fails with error message:

/usr/bin/ld: cannot find -lgfortran

I've already installed the Ubuntu package build-essential:

sudo apt-get install build-essential

I've also tried adding symbolic links:

sudo ln -s /usr/lib/x86_64-linux-gnu/libgfortran.so.3 /usr/lib/libgfortran.so
sudo ln -s /usr/lib/libgfortran.so.3.0.0 /usr/lib/libgfortran.so
sudo ldconfig

I use gcc and g++ regularly, but haven't yet had reason to use gfortran.

I've seen others with this problem on gcc-4.7 (http://ubuntuforums.org/showthread.php?t=2123821), so I wonder if this is from manually installing gcc-4.7. I followed the recipe from the accepted answer here here and here here.

Running lsb_release -a prints

Ubuntu 12.04.2 LTS

and running uname -r prints

3.2.0-39-generic-pae

Can anyone offer advice for why ld doesn't work?

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1  
You tried to make symbolic links against runtime libraries, not the ones that linker wants (*.a dev libs). Looks like the path issue. –  Andrejs Cainikovs Apr 1 '13 at 20:55

1 Answer 1

up vote 1 down vote accepted

You need to install gfortran. The error points out that the static lib for build-time linking is missing not the dynamic libs you tried to adjust.

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When I try sudo apt-get install gfortran, I get 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.... Any thoughts? –  Oliver Apr 1 '13 at 20:06
    
Well, on my system I get for dpkg -S /usr/lib/gcc/x86)64-linux-gnu/4.6/libgfortran.a the answer that this is from the gfortran-4.6 package. Gcc is looking for the .a file. If you installed another gcc version, the linker is looking inside a similarly named directory for libgfortran.a. –  rfindeis Apr 1 '13 at 20:36
    
Looks like a valid answer. –  Andrejs Cainikovs Apr 1 '13 at 20:59
    
Symbolic linking the 4.6 library for the 4.7 compiler might work. Also passing the correct path with -L (which is largely the same). If this fails you need to install the 4.7 version of gfortran from the ppa you used for gcc 4.7. What gfortran version do you have now? –  rfindeis Apr 1 '13 at 21:00
    
I needed to use the same trick as installing gcc-4.7 to install gfortran-4.7. –  Oliver Apr 1 '13 at 23:43

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