[Debian-med-packaging] Bug#721770: mothur: FTBFS on ia64: unrecognized command line option '-m64'

[Aaron M. Ucko]

Source: mothur
Version: 1.31.2+dfsg-1
Severity: serious
Justification: fails to build from source

The ia64 build of mothur failed because GCC doesn't recognize -m64 there:

  if [ 64 -eq 64 ] ; then \
  	    dh_auto_build -- 64BIT_VERSION=yes USEMPI=yes && \
  	    mv mothur mothur-mpi && make clean && \
  	    dh_auto_build -- 64BIT_VERSION=yes USEMPI=no ; \
  	else \
  	    dh_auto_build -- 64BIT_VERSION=no ; \
  	fi
  make[2]: Entering directory `/«BUILDDIR»/mothur-1.31.2+dfsg'
  gfortran -c -m64 *.f
  f951: error: unrecognized command line option '-m64'

I'd suggest doing away with that flag altogether, since it's redundant
on the architectures that do support it (disregarding multiarch
compiler installations, on which mothur of course doesn't build-depend).

Could you please look into it?

Thanks!