> > Stephan, why did you prohibit building mana.c without ROOT and HBOOK
> > support? I think such a configuration is valid and should be allowed.
> 
> Oops, sorry, my fault. I forgto that people use mana.c without ROOT and 
> HBOOK. The reason I made the change was that people forgot the -DHVAE_HBOOK 
> in their makefile. In that case, no HBOOK init is done in mana.c and the 
> first histogram booking in the user code crashes HBOOK.

Ahem. There is only so much rope we can give out to prevent people from shooting
themselves in the foot...

> So please take the #error statement out of mana.c

Done.

> One possibility is that we put an additional layer on top of the histogram 
> boooking/filling. These macros are converted to their HBOOK or ROOT 
> equivalents depending on the HAVE_HBOOK/HAVE_ROOT. If none of both is 
> present, the histogram booking macro can produce a runtime error. This has 
> the additional advantage that users can switch from HBOOK to ROOT without 
> change of their user code.

I can't think of anything other than wrapping every HBOOK call with "if
(!hbook_is_initialized) initialize_hbook();". But then, where is PAWC
coming from anyway?!?

We could also print a warning message "This mana.c has no HBOOK support. If you
see HBOOK crashes, please relink with hmana,c". Ugly, but informative, plus it
points anybody who knows how to read towards a solution.

K.O.