Problem:

While installing Oracle 9.2.0.4 on Oracle Enterprise Linux 4 Update 4, the following error appears:

Error in invoking target install of makefile
/u01/app/oracle/plsql/lib/ins_plsql.mk

Solution:

Applied patch 4198954 (COMPATIBILITY PACKAGES FOR ORACLE ON RHEL 4)

Applying patch 4198954 resolved the installation error.