Follow multi-arch policy

debian/rules

@@ -14,7 +14,8 @@ DEB_CONFIGURE_PREFIX      :=
 DEB_CONFIGURE_SYSCONFDIR  := /etc/nut
 DEB_CONFIGURE_INCLUDEDIR  := /usr/include
 DEB_CONFIGURE_MANDIR      := /usr/share/man
-DEB_CONFIGURE_EXTRA_FLAGS := --without-ssl \
+DEB_CONFIGURE_EXTRA_FLAGS := --libdir=\$${prefix}/lib/$(DEB_HOST_MULTIARCH) \
+                             --without-ssl \
 	                     --with-cgi \
 	                     --with-dev \
 	                     --enable-static \
@@ -25,7 +26,7 @@ DEB_CONFIGURE_EXTRA_FLAGS := --without-ssl \
 	                     --with-htmlpath=/usr/share/nut/www \
 	                     --with-pidpath=/var/run/nut \
 	                     --datadir=/usr/share/nut \
-	                     --with-pkgconfig-dir=/usr/lib/pkgconfig \
+	                     --with-pkgconfig-dir=/usr/lib/$(DEB_HOST_MULTIARCH)/pkgconfig \
 	                     --with-user=nut --with-group=nut
 
 ifeq (linux,$(DEB_HOST_ARCH_OS))
@@ -61,6 +62,10 @@ common-install-arch::
 		mv $${f} $(CURDIR)/debian/tmp/etc/nut/$${nf};  \
 	done
 
+	# Create -dev symlink under /usr
+	ln -s /lib/$(DEB_HOST_MULTIARCH)/libupsclient.so.1.1.0 \
+		$(CURDIR)/debian/tmp/usr/lib/$(DEB_HOST_MULTIARCH)/libupsclient.so
+
 common-install-indep::
 	#install documentation
 	mkdir -p $(CURDIR)/debian/tmp/usr/share/doc/nut-doc/pdf