diff --minimal -Nru libidn-1.33/debian/changelog libidn-1.33/debian/changelog
--- libidn-1.33/debian/changelog	2017-09-13 14:00:38.000000000 +0200
+++ libidn-1.33/debian/changelog	2017-09-13 16:49:23.000000000 +0200
@@ -1,3 +1,10 @@
+libidn (1.33-2.2) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix FTCBFS: Add a native build pass for help2man. (Closes: #-1)
+
+ -- Helmut Grohne <address@hidden>  Wed, 13 Sep 2017 16:49:23 +0200
+
 libidn (1.33-2.1) UNRELEASED; urgency=medium
 
   * Non-maintainer upload.
diff --minimal -Nru libidn-1.33/debian/rules libidn-1.33/debian/rules
--- libidn-1.33/debian/rules	2017-09-13 14:00:38.000000000 +0200
+++ libidn-1.33/debian/rules	2017-09-13 16:49:23.000000000 +0200
@@ -1,28 +1,39 @@
 #!/usr/bin/make -f
 
+include /usr/share/dpkg/architecture.mk
+
 export DH_VERBOSE=1
 
 export DEB_BUILD_MAINT_OPTIONS=hardening=+all
 
+CFG_VERS = `dpkg-parsechangelog | grep ^Version: | cut -d\  -f2`
+
 DOPACKAGES = $(shell dh_listpackages)
-CONFIGURE_FLAGS :=
+CONFIGURE_FLAGS := \
+	--with-packager=Debian \
+	--with-packager-version=$(CFG_VERS) \
+	--with-packager-bug-reports=https://bugs.debian.org/ \
+	--disable-silent-rules
 ifneq ($(filter libidn11-java,$(DOPACKAGES)),)
 CONFIGURE_FLAGS += --enable-java
 else
 CONFIGURE_FLAGS += --disable-java
 endif
+NATIVE = eval $$(dpkg-architecture -f -a$(DEB_BUILD_ARCH) -s);
 
 %:
 	dh $@ --parallel --builddirectory=build --with autoreconf
 
-CFG_VERS = `dpkg-parsechangelog | grep ^Version: | cut -d\  -f2`
-
 override_dh_auto_configure:
-	dh_auto_configure -- --with-packager=Debian \
-		--with-packager-version=$(CFG_VERS) \
-		--with-packager-bug-reports=https://bugs.debian.org/ \
-		--disable-silent-rules \
-		$(CONFIGURE_FLAGS)
+ifneq ($(DEB_BUILD_ARCH),$(DEB_HOST_ARCH))
+	$(NATIVE) dh_auto_configure -- $(CONFIGURE_FLAGS)
+	$(NATIVE) dh_auto_build
+	$(NATIVE) dh_auto_clean
+	test -f doc/idn.1
+	dh_auto_configure -- $(CONFIGURE_FLAGS) HELP2MAN=true
+else
+	dh_auto_configure -- $(CONFIGURE_FLAGS)
+endif
 
 override_dh_auto_install:
 	dh_auto_install