oracle 8.1.6.1 missing libs: libplsf.a, etc

I am trying to move from a working oracle 8.0.5 client on redhat linux 5.2 to oracle 8.1.6.1 on redhat 6.2.

When we try to recompile our software we get the following errors:

cat: /usr/home/oracle/app/oracle/product/8.1.6.1/lib/naldflgs: No such file or directory
g++: /usr/home/oracle/app/oracle/product/8.1.6.1/lib/libplsf.a: No such file or directory
g++: /usr/home/oracle/app/oracle/product/8.1.6.1/lib/libplsb.a: No such file or directory
g++: /usr/home/oracle/app/oracle/product/8.1.6.1/lib/libextp.a: No such file or directory

These files exist on the 8.0.5 system, but not with the new install of oracle8i.

Are these files supposed to exist or is their functionality provided elsewhere?

If they are supposed to exist, any reason they might not have gotten installed and/or tips to fix this?

Thanks,

-- 
Michelle Dick             artemis_at_rahul.net              East Palo Alto, CA