diff -Nru proj-4.7.0/debian/changelog proj-4.7.0/debian/changelog
--- proj-4.7.0/debian/changelog	2012-05-23 06:01:10.000000000 -0700
+++ proj-4.7.0/debian/changelog	2013-03-13 16:26:46.000000000 -0700
@@ -1,3 +1,10 @@
+proj (4.7.0-2+libtool) unreleased; urgency=low
+
+  * Update libtool at build time using dh-autoreconf, in order to fix a
+    build failure on x32.
+
+ -- Daniel Schepler <schepler@debian.org>  Wed, 13 Mar 2013 16:26:39 -0700
+
 proj (4.7.0-2) unstable; urgency=medium
 
   * Moved to source format 3.0 with quilt support.
diff -Nru proj-4.7.0/debian/control proj-4.7.0/debian/control
--- proj-4.7.0/debian/control	2012-05-23 06:01:10.000000000 -0700
+++ proj-4.7.0/debian/control	2013-03-13 16:24:40.000000000 -0700
@@ -3,7 +3,7 @@
 Priority: extra
 Maintainer: Debian GIS Project <pkg-grass-devel@lists.alioth.debian.org>
 Uploaders: Francesco Paolo Lovergine <frankie@debian.org>
-Build-Depends: debhelper (>= 9), sharutils
+Build-Depends: debhelper (>= 9), sharutils, dh-autoreconf
 Standards-Version: 3.9.3
 Homepage: http://trac.osgeo.org/proj/
 Vcs-Browser: http://git.debian.org/?p=pkg-grass/proj.git
diff -Nru proj-4.7.0/debian/rules proj-4.7.0/debian/rules
--- proj-4.7.0/debian/rules	2012-05-23 06:01:10.000000000 -0700
+++ proj-4.7.0/debian/rules	2013-03-13 16:26:05.000000000 -0700
@@ -18,8 +18,12 @@
 	unshar -c -d $(CURDIR)/nad $(CURDIR)/debian/datumgrids-ch.shar
 	touch $@
 
+autoreconf-stamp:
+	dh_autoreconf
+	touch $@
+
 config: datumgrids config.status
-config.status: 
+config.status: autoreconf-stamp
 	./configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man
 
 build: config build-stamp
@@ -32,9 +36,10 @@
 	dh_testdir
 	dh_testroot
 	( cd $(CURDIR)/nad && cat $(CURDIR)/debian/datumgrids.list $(CURDIR)/debian/datumgrids-ch.list | xargs rm -f )
-	rm -f datumgrids-stamp
+	rm -f datumgrids-stamp autoreconf-stamp
 	[ ! -f Makefile ] || $(MAKE) distclean
 	rm -f $(CURDIR)/debian/*.log
+	dh_autoreconf_clean
 	dh_clean
 
 install: build install-stamp