...
 
 cd /build/mesa &&
git reset --hard &&
git clean -xdf &&
git pull &&
PKG_CONFIG_PATH=/usr/lib/i386-linux-gnu/pkgconfig:/usr/lib/pkgconfig:/usr/local/share/pkgconfig \
./autogen.sh --sysconfdir=/etc \
--prefix=/usr \
--libdir=/usr/lib/i386-linux-gnu \
--build=x86_64-linux-gnu \
--host=i386-linux-gnu \
CFLAGS="-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -march=native" \
CPPFLAGS="-D_FORTIFY_SOURCE=2" \
CXXFLAGS="-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -march=native" \
FFLAGS="-g -O2 -fstack-protector --param=ssp-buffer-size=4" \
GCJFLAGS="-g -O2 -fstack-protector --param=ssp-buffer-size=4" \
LDFLAGS="-Wl,-Bsymbolic-functions -Wl,-z,relro" \
--with-llvm-prefix=/usr/lib/llvm-3.7 \
--enable-texture-float \
--enable-debug \
--enable-gles1 \
--enable-gles2 \
--with-gallium-drivers=radeonsi,swrast \
--with-egl-platforms=x11,drm \
--with-dri-drivers= \
--enable-vdpau \
--enable-glx-tls \
--enable-gbm \
--enable-osmesa &&
pkgversion=$(git describe --tags) &&
pkgversion=${pkgversion#mesa-} &&
make -j8 &&
fakeroot checkinstall --install=yes --replaces libosmesa6:i386,libgbm-dev,libgl1-mesa-dev,libglapi-mesa:i386,libgbm1:i386,libegl1-mesa-dev,libgl1-mesa-dri:i386,\
libgl1-mesa-glx:i386,libegl1-mesa:i386,libegl1-mesa-drivers:i386,libosmesa6-dev,mesa-common-dev,libgles2-mesa:i386 --pkgname=mesa32 --pkgversion="${pkgversion}" --pkgarch=i386 --backup=no --exclude=/usr/include,/etc --nodoc --default &&
mv -- ./*.deb /build/completed || exit $?


...