Please consider the following change to the net-snmp spec file which allows it to be built for ppc64le:

diff --git a/net-snmp.spec b/net-snmp.spec
index 6da14f7..160f1ef 100644
--- a/net-snmp.spec
+++ b/net-snmp.spec
@@ -65,7 +65,7 @@ BuildRequires: net-tools
 # for make test
 BuildRequires: perl(TAP::Harness)
 BuildRequires: systemd-units
-%ifnarch s390 s390x
+%ifnarch s390 s390x ppc64le
 BuildRequires: lm_sensors-devel >= 3
 %endif
 %if %{netsnmp_tcp_wrappers}
@@ -107,7 +107,7 @@ Requires: elfutils-devel, rpm-devel, elfutils-libelf-devel, openssl-devel
 %if %{netsnmp_tcp_wrappers}
 Requires: tcp_wrappers-devel
 %endif
-%ifnarch s390 s390x
+%ifnarch s390 s390x ppc64le
 Requires: lm_sensors-devel
 %endif
 # pull perl development libraries, net-snmp agent libraries may link to them
@@ -223,7 +223,7 @@ MIBS="host agentx smux \
      ip-mib/ipv6ScopeZoneIndexTable ip-mib/ipIfStatsTable \
      sctp-mib rmon-mib etherlike-mib"
 
-%ifnarch s390 s390x
+%ifnarch s390 s390x ppc64le
 # there are no lm_sensors on s390
 MIBS="$MIBS ucd-snmp/lmsensorsMib"
 %endif