... checking pthread.h usability... yes checking pthread.h presence... yes checking for pthread.h... yes checking for pthread_create in -lpthread... yes checking for SYSLOG_UNIXAF support... yes checking for FSSTND support... yes checking gnutls/gnutls.h usability... yes checking gnutls/gnutls.h presence... yes checking for gnutls/gnutls.h... yes checking for libgnutls-config... no configure: error: in `/var/tmp/portage/app-admin/rsyslog-3.21.10/work/rsyslog-3.21.10': configure: error: libgnutls-config not found in PATH 'libgnutls-config' and 'libgnutls-extra-config' scripts have been removed in >=net-libs/gnutls-2.7.1, so 'pkg-config gnutls' / 'pkg-config gnutls-extra' should be used.
Fixed in version bump to 3.22.0