building aspell-bn-git for ubuntu

/lp/aspell-bn-0.2$ dpkg-buildpackage -uc -us
dpkg-buildpackage: info: source package aspell-bn
dpkg-buildpackage: info: source version 0.2
dpkg-buildpackage: info: source distribution unstable
dpkg-buildpackage: info: source changed by Pavel Sayekat <pavelsayekat@gmail.com>
dpkg-buildpackage: info: host architecture amd64
 dpkg-source --before-build aspell-bn-0.2
 fakeroot debian/rules clean
dh clean
   dh_clean
 dpkg-source -b aspell-bn-0.2
dpkg-source: info: using source format '3.0 (native)'
dpkg-source: info: building aspell-bn in aspell-bn_0.2.tar.xz
dpkg-source: info: building aspell-bn in aspell-bn_0.2.dsc
 debian/rules build
dh build
   dh_update_autotools_config
   dh_autoreconf
   dh_auto_configure
	./configure --build=x86_64-linux-gnu --prefix=/usr --includedir=\${prefix}/include --mandir=\${prefix}/share/man --infodir=\${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-silent-rules --libdir=\${prefix}/lib/x86_64-linux-gnu --libexecdir=\${prefix}/lib/x86_64-linux-gnu --disable-maintainer-mode --disable-dependency-tracking
Warning: future versions will require --vars before variables are set
: error: invalid variable name: --build
dh_auto_configure: ./configure --build=x86_64-linux-gnu --prefix=/usr --includedir=\${prefix}/include --mandir=\${prefix}/share/man --infodir=\${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-silent-rules --libdir=\${prefix}/lib/x86_64-linux-gnu --libexecdir=\${prefix}/lib/x86_64-linux-gnu --disable-maintainer-mode --disable-dependency-tracking returned exit code 1
debian/rules:18: recipe for target 'build' failed
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2