snmp_agent plugin was added in version 5.8.0 by https://github.com/collectd/collectd/commit/8aba9d6e33dea747e4e27e35457f00c287e2c678 It depends on "struct tree" (from net-snmp/library/parse.h) which is included if BR2_PACKAGE_NETSNMP_ENABLE_MIBS is set Fix this error by updating configure.ac to check for get_tree in addition to init_agent Fixes: - http://autobuild.buildroot.org/results/3e24a7671e65974815072f92efaa490d2950b3d9 Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Tested-by: Bernd Kuhls <bernd.kuhls@t-online.de> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>