I receive an error while installing Oracle 9i:

Error in invoking target install of makefile
/opt/oracle/product/9.2.0/sqlplus/lib/ins_sqlplus.mk


Furthermore:
$ whoami
oracle

$ echo $ORACLE_HOME
/opt/oracle/product/9.2.0

$ pwd
/opt/oracle/product/9.2.0/sqlplus/lib
$ ll
total 30672
-rw-r--r-- 1 oracle dba 42735 Apr 26 2002 env_sqlplus.mk
-rw-r--r-- 1 oracle dba 1157 Apr 26 2002 ins_sqlplus.mk
-rw-r--r-- 1 oracle dba 2872 Apr 26 2002 s0afimai.o
-rw-r--r-- 1 oracle dba 2768 Apr 26 2002 safiimfg.o
-rw-rw-r-- 1 oracle dba 15626288 Jan 21 23:50 sqlplus

What is going on here?

Regards,
Chris