Fixes: http://autobuild.buildroot.net/results/02a2b1d9ece040c529308800403f0230ead4ed3e/ The previous build setup would check for pidfd_open using AC_CHECK_FUNC and would be incorrectly reported as true. Backport patch from upstream: [1] https://gitlab.com/procps-ng/procps/-/commit/2507bc475782ff5e0541d37c780dff1e293c9553 [2] https://gitlab.com/procps-ng/procps/-/commit/587efb47df7ddbfda4e6abdd1e7792a2531a238f [3] https://gitlab.com/procps-ng/procps/-/commit/5acbb5dc1587d688de646d739a97251eb893bbb0 Signed-off-by: Scott Fan <fancp2007@gmail.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>