Rhel4 fixes

[henjo]

Here comes some modifications to qsnake that are needed to make qsnake compile on RHEL4. It is still not working with libqsnake but the basic packages build.

I guess the problem with libqsnake is that the version of gfortran is too old (4.1.2). This is the error message I get:
[ 75%] Building Fortran object qsnake/CMakeFiles/cmesh.dir/fmesh_wrapper.f90.o
[100%] Building CXX object qsnake/CMakeFiles/cmesh.dir/cmesh.cpp.o
In file /nfs/home/henrik/qsnake/spkg/build/libqsnake-2cfde83/qsnake/fmesh_wrapper.f90:3

use iso_c_binding
1
Fatal Error: Can't open module file 'iso_c_binding.mod' for reading at (1): No such file or directory
make[2]: *** [qsnake/CMakeFiles/cmesh.dir/fmesh_wrapper.f90.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [qsnake/CMakeFiles/cmesh.dir/all] Error 2
make: *** [all] Error 2

Qsnake build failed.

[certik]

Thanks for this! Let me try to build it on my machines and if all is ok, I'll push it in.

Yes, it needs at least gfortran 4.3 (I think). In order to make fortran usable, it needs the iso_c_binding module, otherwise you can't easily interface with C (or Python).

I don't know how to best approach this.