R12.1.2 Relinking issues after 64bit Migration

We have a large R12 upgrade coming up on the horizon.  Upgrading to R12.1.2, 11gR2 and migrating to 64bit.   As part of the post 64bit migration you have to relink the application programs.  A number of modules wouldn’t relink tho:

Example:

g++: /u01/TEST/apps/apps_st/appl/sht/12.0.0/lib/ilog/6.2/libschedule.a: No such file or directory
g++: /u01/TEST/apps/apps_st/appl/sht/12.0.0/lib/ilog/6.2/libsolveriim.a: No such file or directory
g++: /u01/TEST/apps/apps_st/appl/sht/12.0.0/lib/ilog/6.2/libconcertext.a: No such file or directory
g++: /u01/TEST/apps/apps_st/appl/sht/12.0.0/lib/ilog/6.2/libsolver.a: No such file or directory
g++: /u01/TEST/apps/apps_st/appl/sht/12.0.0/lib/ilog/6.2/libconcert.a: No such file or directory
make: *** [/u01/TEST/apps/apps_st/appl/eng/12.0.0/bin/ENCACN] Error 1
Done with link of eng executable 'ENCACN' on Tue Oct 19 15:32:10 EDT 2010
Relink of module "ENCACN" failed.


I opened up an SR with oracle but continued to research the problem.   I didn't see anything on Metalink for R12, Google same result.   I searched the entire filesystem to see if the libraries existed elsewhere but no luck
.
I noticed a zip file /u01/TEST/apps/apps_st/appl/sht/12.0.0/lib/ilog62lib.zip and listed the contents to see what was in it.  Here is a snip:

[oravis@myserver lib]$ unzip -l ilog62lib.zip
Archive:  ilog62lib.zip
$$Header: ilog62lib.zip 120.5 2006/10/02 17:00  juliang ship                       $
Length     Date   Time    Name
--------    ----   ----    ----
0  05-02-06 02:12   ilog/
0  09-27-06 18:09   ilog/6.2/LINUX/
2  09-27-06 18:08   ilog/6.2/LINUX/libconcert.a
2  09-27-06 18:08   ilog/6.2/LINUX/libconcertext.a
8  09-27-06 18:08   ilog/6.2/LINUX/libcplex.a
2  09-27-06 18:08   ilog/6.2/LINUX/libilocplex.a
8  09-27-06 18:08   ilog/6.2/LINUX/libschedule.a
0  09-27-06 18:08   ilog/6.2/LINUX/libsolver.a
0  09-27-06 18:08   ilog/6.2/LINUX/libsolverfloat.a
0  09-27-06 18:08   ilog/6.2/LINUX/libsolveriim.a
.
.
.
--------                   -------
665793708                   72 files

The libraries adrelink was looking for.  I extracted the files, changed to the LINUX directory, moved the files up to the parent directory,  relinked (via adadmin) and it completed successfully.

----

Looking back on the problem, its strange I didn't encounter it before.   This environment is a copy of an existing R12.1.2 32bit environment.   The only thing i'm changing is migrating it to 64bit.   So I should have hit these relinking issues before.   I checked the source environment and the libraries are indeed there!  

The zip file contains the libraries for a number of platforms, AIX, HPUX, etc.   So the only thing I can think of is that since i'm doing a platform migration, these libraries get removed to make sure the proper ones are used.  However, it doesn't continue and extract the correct libaries from the zip file.