Dear Maintainer, Calling autoconf before running configure script fixes the issue about detecting whether fork() is available in AC_FUNC_FORK macro.
Sylvain
diff -Nru a/debian/rules b/debian/rules --- a/debian/rules 2019-08-19 00:44:52.000000000 +0000 +++ b/debian/rules 2019-10-27 13:47:20.459298199 +0000 @@ -18,6 +18,7 @@ endif config.status: $(QUILT_STAMPFN) configure + autoconf dh_testdir [ -e orig_config ] || mkdir orig_config [ ! -f config.sub ] || mv config.sub orig_config
