When installing Oracle 11g on Fedora 13 you may get the following error :

              Error in invoking target 'agent nmb nmo nmhs tclexec' of makefile '/u01/app/oracle/product/11.1.0/db_1/sysman/lib/ins_emagent.mk

Solution

Within the file detailed in the error edit it and find the line that reads '$(MK_EMAGENT_NMECTL)' change this to '$(MK_EMAGENT_NMECTL) -lnnz11'

Note : edit this file while you still have the installer open, once you have changed it just click retry.