[opensuse-arm] armv6: checking whether fd passing works... no

HI! I'm trying to build a dovecot update ob openSUSE Build Service for openSUSE_Factory_ARM armv6 but it fails: [ 516s] checking whether fd passing works... no [ 516s] configure: error: fd passing is required for Dovecot to work https://build.opensuse.org/package/live_build_log/home:stroeder:branches:ser... It builds on all other platforms including openSUSE_Tumbleweed i586 and openSUSE_Factory_ARM armv7l and aarch64. Any clue what's missing here? Ciao, Michael.