make dist fixes

src/mhd2/Makefile.am

@@ -176,3 +176,12 @@ $(CONFIG_HEADER): $(builddir)/../incl_priv/mhd_config.h.in $(top_srcdir)/configu
 $(builddir)/../incl_priv/mhd_config.h.in: $(top_srcdir)/configure.ac
 	@echo "cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh" && \
 	  $(am__cd) $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+update-po-POTFILES.in: $(top_srcdir)/po/POTFILES.in
+
+$(top_srcdir)/po/POTFILES.in: $(srcdir)/Makefile.am
+	@echo "Creating $@"
+	@echo  src/include/microhttpd2.h > "$@" && \
+	for src in $(am__libmicrohttpd2_la_SOURCES_DIST) ; do \
+	  echo "$(subdir)/$$src" >> "$@" ; \
+	done