Compiler linking

[Robert Kopp]

I downloaded the source code for deal.II in Ubuntu, which contains the example files. (I'm a beginner.) I noted, however, that a binary is available for Ubuntu (18.04) and installed that, instead of compiling the library. Then I attempted to run step-1.cc from the source code package, after determining that the library was in /usr/include:

(base) robert@robert-desktop:~/deal/dealii-9.1.1/examples/step-1$ cmake -DDEAL_II_DIR=/usr/include/deal.II .

CMake Error at CMakeLists.txt:30 (MESSAGE):

  

  *** Could not locate a (sufficiently recent) version of deal.II.  ***

  

  You may want to either pass a flag -DDEAL_II_DIR=/path/to/deal.II to cmake

  or set an environment variable "DEAL_II_DIR" that contains this path.

-- Configuring incomplete, errors occurred!

It's not clear to me why this doesn't work, but it doesn't work that way on Debian either. Any advice would be appreciated.

[Matthias Maier]

If you want to use binary packages I highly recommend to use the PPA
here in order to get the newest version:

https://launchpad.net/~ginggs/+archive/ubuntu/deal.ii-backports

After that make sure that you actually install the developer
version. All in one:

sudo add-apt-repository ppa:ginggs/deal.ii-backports
sudo apt-get update
sudo apt-get install libdeal.ii-dev

After that, a simple $ cmake . should be enough to configure the
example steps.

Best,
Matthias