Thomas Danckaert <post@thomasdanckaert.be> writes:

> Hi Guix,
>
> this patch enables HDF4 support in the netCDF package.
>
> By the way, I noticed some error messages from doxygen during the 
> build:
>
> error: Problems running dot: exit code=127, command='dot', 
> arguments='"/tmp/guix-build-netcdf-4.4.1.1.drv-0/netcdf-4.4.1.1/docs/html/datt_8c__incl.dot" 
> -Tpng -o 
> "/tmp/guix-build-netcdf-4.4.1.1.drv-0/netcdf-4.4.1.1/docs/html/datt_8c__incl.png"'
> (these error are already in the present package, for example see 
> http://hydra.gnu.org/build/1686038/log/raw ).
>
> These errors don't cause the build to fail, and are related to 
> html/pdf documentation, which is not installed anyway, as far is I 
> can see.  So perhaps not very critical.
>
> When I build the package myself in a “guix environment netcdf”, I 
> can't reproduce the errors.

The above error indicates that the 'dot' command cannot be found during
the build process. If it works in `guix environment netcdf`, perhaps you
are on a foreign distro and have /usr/bin/dot in your PATH? In any case
it should be fixed in a separate patch, and likely only needed for
documentation.

I've applied this patch, thanks!

> From 893ef9ad6bfb8edbe64d64f3ab5d6a0bd4705a5f Mon Sep 17 00:00:00 2001
> From: Thomas Danckaert <thomas.danckaert@gmail.com>
> Date: Fri, 23 Dec 2016 14:56:00 +0100
> Subject: [PATCH] gnu: netcdf: Enable HDF4 support.
>
> * gnu/packages/maths.scm (netcdf)[inputs]: Add hdf4-alt and libjpeg.
>   [arguments]: Add "--enable-hdf4" configure flag.
> ---
>  gnu/packages/maths.scm | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
> index e15eddc..d045895 100644
> --- a/gnu/packages/maths.scm
> +++ b/gnu/packages/maths.scm
> @@ -726,10 +726,12 @@ HDF5 file is encoded according to the HDF File Format Specification.")
>         ("doxygen" ,doxygen)
>         ("graphviz" ,graphviz)))
>      (inputs
> -     `(("hdf5" ,hdf5)
> -       ("zlib" ,zlib)))
> +     `(("hdf4" ,hdf4-alt)
> +       ("hdf5" ,hdf5)
> +       ("zlib" ,zlib)
> +       ("libjpeg" ,libjpeg)))
>      (arguments
> -     `(#:configure-flags '("--enable-doxygen" "--enable-dot")
> +     `(#:configure-flags '("--enable-doxygen" "--enable-dot" "--enable-hdf4")
>         #:parallel-tests? #f))           ;various race conditions
>      (home-page "http://www.unidata.ucar.edu/software/netcdf/")
>      (synopsis "Library for scientific data")
> -- 
> 2.7.4