Automake conditional ..question

[Rashmi Keshava Iyengar]

Hi,

   I'm trying to do the following 

   In  configure.ac
  
   BLDCHK=' '; AC_SUBST(BLDCHK)

   In   MakefileProlog.ami

 COMMONDEFINES = -D_GNU_SOURCE -D_REENTRANT -DLINUX   -DTURN_DEBUGGING_OFF
@address@hidden ($(U32BUILD),1)
        COMMONDEFINES += -DUINT_WORD32
@address@hidden

  Makefile.am  includes MakefileProlog.ami as its first line 

  I generate the make files and hope to be able to build them as below

  make U32BUILD=1  

   But this doesn't work (i.e.: the UINT_WORD32 remains undefined)
because the makefiles that were generated are like this:

    ------ start ------

    ---- stuff  -------

   COMMONDEFINES = -D_GNU_SOURCE -D_REENTRANT -DLINUX -DTURN_DEBUGGING_OFF

    ---- some more stuff ------

   ---- rules to build all the binaries ----

ifeq ($(U32BUILD),1)
        COMMONDEFINES += -DUINT_WORD32
endif 

----------- end ----------------

The conditional is the very last thing before the end of the makefile,
there is no reference to $U32BUILD anywhere else in the Makefile. Why
is the Makefile being generated this way??

What else do I need to do so that COMMONDEFINES gets set with the
proper flags before the binaries are built ???

BTW, I'm using Automake version 1.6.3 and Autoconf version 2.57 and
make version 3.79.1

Any help ?

TIA 
Rashmi