Here is the error message I got from oracle. The oracle filter command could not be found in HP-UX.

ERROR at line 1:
ORA-29855: error occurred in the execution of ODCIINDEXCREATE routine
ORA-20000: Oracle Text error:
DRG-11206: user filter command /u01/app/oracle/product/9.2.0SE/ctx/bin/ctxhx
could not be executed
ORA-06512: at "CTXSYS.DRUE", line 157

I tried to search the Oracle website. It seems the customers need to make the ctxhx program file by themselves.Is it true? If it is true, what kind of compiler I should use in HP-UX