The attached patch fixes the following:
 
_ Two '#if' statements changed to '#ifdef', as it looks it was
originally intended. This avoids compilation problems when the
corresponding symbols are just defined (and not defined as 1).
_ Possible redefinition of standard v?[afs]?n?printf in mprintf.h. The
patch inserts #undef's before definitions to avoid compilation failures
when the standard header files already define these symbols.