Error mibII/system_mib.c:68: error: `NETSNMP_SYS_CONTACT' undeclared here (not in a function)

Hello

I'am getting the following errors on building net-snmp on slackware 10.0. 
Has anyone a hint what the problem is? 

gcc -I../../include -I. -I../../agent -I../../agent/mibgroup 
-I../../snmplib -fno-strict-aliasing -I/usr/local/include 
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 
-I/usr/lib/perl5/5.8.4/i486-linux/CORE -g -O2 -Ulinux -Dlinux=linux 
-I/usr/include/rpm -c mibII/system_mib.c  -fPIC -DPIC -o 
mibII/.libs/system_mib.o
mibII/system_mib.c:68: error: `NETSNMP_SYS_CONTACT' undeclared here (not 
in a function)
make[2]: *** [mibII/system_mib.lo] Error 1
make[2]: Leaving directory `/home/net-snmp-5.4.1/agent/mibgroup'
make[1]: *** [subdirs] Error 1
make[1]: Leaving directory `/home/net-snmp-5.4.1/agent'
make: *** [subdirs] Error 1

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