[petsc-users] configure error with netcdf

[Satish Balay]

On Sun, 9 Sep 2012, Barry Smith wrote:

> 
> On Sep 9, 2012, at 7:55 AM, Matthew Knepley <knepley at gmail.com> wrote:
> 
> > On Sun, Sep 9, 2012 at 12:31 AM, Satish Balay <balay at mcs.anl.gov> wrote:
> > > ncgentab.c:(.text+0x1e2): undefined reference to `yyunput'
> 
>    Satish,
> 
>   Weird undefined symbols like yyunput are always a result of flex issues. 
> 
>     Could you please make the same changes to netcdf.py that you made to the other package that used flex (which resolved the problem there).

In this case netcdf has its own configure - and does its own search for flex etc.

>>>
checking for flex... flex
checking lex output file root... lex.yy
checking lex library... -lfl
<<<

So the tools appear to be found. And I don't see them being used
further down [in configure.log].  So its not clear if 'missing flex'
is the cause of this error.


And after my patch [with netcdf upgrade] - I have a successful build
of netcdf on rhel5 - even without flex/bison.

However flex is needed for ptscotch anyway [so one would get an error
from ptscotch if flex is missing]

Satish