I am using ubuntu 64bit, I was having the same problems you guys were having. when i added the 32bit path I find a different probelm.
NFO: gcc -m32 -o /opt/oracle-home/oracle/11.1.0/db_1/rdbms/lib/extproc32 -L/opt/oracle-home/oracle/11.1.0/db_1/rdbms/lib32/ -L/opt/oracle-home/oracle/11.1.0/db_1/lib32/ -L/opt/oracle-home/oracle/11.1.0/db_1/lib32/stubs/ /opt/oracle-home/oracle/11.1.0/db_1/rdbms/lib32/hormc.o /opt/oracle-home/oracle/11.1.0/db_1/rdbms/lib32/homts.o -lagtsh -lpthread -lclntsh `cat /opt/oracle-home/oracle/11.1.0/db_1/lib32/sysliblist` -Wl,-rpath,/opt/oracle-home/oracle/11.1.0/db_1/lib32 -lm `cat /opt/oracle-home/oracle/1
INFO: 1.1.0/db_1/lib32/sysliblist` -ldl -lm -L/opt/oracle-home/oracle/11.1.0/db_1/lib32
INFO: /usr/bin/ld: cannot find -lagtsh
INFO: collect2: ld returned 1 exit status
INFO: make[1]: *** [/opt/oracle-home/oracle/11.1.0/db_1/rdbms/lib/extproc32] Error 1
INFO: make[1]: Leaving directory `/opt/oracle-home/oracle/11.1.0/db_1/rdbms/lib'
INFO: make: *** [extproc32] Error 2
INFO: End output from spawned process.
INFO:
INFO: Exception thrown from action: make
Exception Name: MakefileException
Exception String: Error in invoking target 'all_no_orcl' of makefile '/opt/oracle-home/oracle/11.1.0/db_1/rdbms/lib/ins_rdbms.mk'. See '/u01/app/oraInventory/logs/installActions2008-03-13_05-58-42PM.log' for details.
Exception Severity: 1
Im assuming that agtsh can't be found? if so where can i get it ?