Bug#862459: gerris lacks dependency on gcc

[Adrian Bunk]

Source: gerris
Version: 20131206+dfsg-7
Severity: serious

Using the example from #815824:

% wget
http://gerris.dalembert.upmc.fr/gerris/examples/examples/boussinesq/boussinesq.gfs
% gerris2D boussinesq.gfs
gerris: file `boussinesq.gfs' is not a valid simulation file
boussinesq.gfs:61:74: error compiling expression
/usr/share/gerris/build_function: 28: /usr/share/gerris/build_function: gcc: not found
$