tern(72)> gcc students.cc
gendb.cc: In method `list::list(char *, int)':
In file included from students.cc:64:
gendb.cc:2425: warning: ANSI C++ forbids old style base class initialization
/usr/lib/cmplrs/cc/ld:
Undefined:
_9UserTypes$object_count
collect2: ld returned 1 exit status
tern(73)> pwd
/nfs/cs/proj3/case/gen/gendb
tern(74)> date
Mon Feb  7 11:07:08 EST 1994
tern(75)> 



Second Try: using g++:

tern(78)> g++ students.cc
gendb.cc: In method `list::list(char *, int)':
In file included from students.cc:64:
gendb.cc:2425: warning: ANSI C++ forbids old style base class initialization
/usr/lib/cmplrs/cc/ld:
Undefined:
_9UserTypes$object_count
collect2: ld returned 1 exit status


Search for the missing stuff:

   Diagnostics
cs(91)> egrep -n 'UserTypes || object\_count' gendb.hpp
egrep: syntax error
cs(92)> egrep -n 'UserTypes | object\_count' gendb.hpp
129:    static int               object_count;
146:extern UserTypes user_types;
cs(93)> egrep -n 'UserTypes | object\_count' gendb.cc
463:UserTypes user_types; // declare a single global instance to hold all
470:   printf("Cannot define multiple UserTypes objects, one is automatically declared for you\n");
473: object_count = 1;
cs(94)>