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 <tiago@skewed.de>:
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 <tiago@skewed.de>


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