Thanks for the advice. I added the repository and installed gcc-5 via
Synaptics.
I asked for ./configure CXX="gcc-5" as you said, but I still get the error
message

checking whether gcc-5 supports C++14 features by default... no
checking whether gcc-5 supports C++14 features with -std=gnu++14... no
checking whether gcc-5 supports C++14 features with -std=gnu++0x... no
configure: error: *** A compiler with support for C++14 language features
is required.

My version of gcc-5 is
gcc version 5.3.0 20151204 (Ubuntu 5.3.0-3ubuntu1~14.04)

What am I doing wrong?

2016-04-13 18:08 GMT+02:00 Tiago de Paula Peixoto <[email protected]>:

> On 13.04.2016 17:13, Yannis Haralambous wrote:
> > I'm trying to install graph-tool under Ubuntu 14. I didn't found gcc5
> > in the list of synaptic packages but I did installed clang3.4.
>
> Clang 3.4 is too old to compile graph-tool.
>
> Please read the installation instructions carefully, in particular the
> note about Ubuntu 14:
>
>     https://graph-tool.skewed.de/download#debian
>
> which says:
>
>     When using Ubuntu 14.04 LTS (Trusty Tahr) or 15.04 (Vivid Vervet),
>     it is necessary need to install the following PPA repository, which
>     contains a newer GCC version and associated libraries:
>
>     add-apt-repository ppa:ubuntu-toolchain-r/test
>
> This will give you GCC 5.
>
> Also, please use the pre-compiled packages for Ubuntu, instead of
> trying compiling it yourself.
>
> > But when I run ./configure, it doesn't find clang3.4 (and probably
> > detects pre-installed gcc 4.8.2 instead).  How can I tell ./configure
> > to use clang3.4 rather than gcc4.8.2 ?
>
> To select a particular compiler, e.g. GCC 5, you have to call
>
>     ./configure CXX="gcc-5"
>
> But please try to install the pre-compiled packages first, since it is
> far easier.
>
> Best,
> Tiago
>
> --
> Tiago de Paula Peixoto <[email protected]>
>
>
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