Thanks I am now able to install perl in my custom directory..which is /cac/customperl/bin/perl/..Now when I am trying to install DBD::Oracle 1.74 using below commands.

 /cac/customperl/bin/perl Makefile.PL
make 
make test
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at make test It is throwing the below error

 
t/000-report-versions-tiny.t .. ok
t/00versions.t ................ Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/00versions.t line 10.
Compilation failed in require at t/00versions.t line 10.
BEGIN failed--compilation aborted at t/00versions.t line 10.
# Looks like your test exited with 2 before it could output anything.
t/00versions.t ................ Dubious, test returned 2 (wstat 512, 0
+x200)
Failed 2/2 subtests
t/01base.t .................... 1/6
#   Failed test 'install_driver'
#   at t/01base.t line 24.
#          got: 'install_driver(Oracle) failed: Can't load '/scripts/D
+BD-Oracle-1.74/blib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::O
+racle: ld.so.1: perl: fatal: /opt/oracle/product/11g/db_1/lib/libclnt
+sh.so.11.1: wrong ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1
+/sun4-solaris/DynaLoader.pm line 193.
#  at (eval 11) line 3.
# Compilation failed in require at (eval 11) line 3.
# Perhaps a required shared library or dll isn't installed where expec
+ted
#  at t/01base.t line 21.
# '
#     expected: ''
# Failed to load Oracle extension and/or shared libraries
# Looks like you failed 1 test of 6.
t/01base.t .................... Dubious, test returned 1 (wstat 256, 0
+x100)
Failed 1/6 subtests
        (less 2 skipped subtests: 3 okay)
t/10general.t ................. Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/10general.t line 8.
Compilation failed in require at t/10general.t line 8.
BEGIN failed--compilation aborted at t/10general.t line 8.
t/10general.t ................. Dubious, test returned 2 (wstat 512, 0
+x200)
No subtests run
t/12impdata.t ................. Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/nchar_test_lib.pl line 6.
Compilation failed in require at t/nchar_test_lib.pl line 6.
BEGIN failed--compilation aborted at t/nchar_test_lib.pl line 6.
Compilation failed in require at t/12impdata.t line 25.
t/12impdata.t ................. Dubious, test returned 2 (wstat 512, 0
+x200)
No subtests run
t/14threads.t ................. skipped: this solaris perl 5.020001 no
+t configured to support iThreads
t/15nls.t ..................... Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/nchar_test_lib.pl line 6.
Compilation failed in require at t/nchar_test_lib.pl line 6.
BEGIN failed--compilation aborted at t/nchar_test_lib.pl line 6.
Compilation failed in require at t/15nls.t line 9.
t/15nls.t ..................... Dubious, test returned 2 (wstat 512, 0
+x200)
No subtests run
t/20select.t .................. Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/20select.t line 4.
Compilation failed in require at t/20select.t line 4.
BEGIN failed--compilation aborted at t/20select.t line 4.
t/20select.t .................. Dubious, test returned 2 (wstat 512, 0
+x200)
No subtests run
t/21nchar.t ................... Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/21nchar.t line 12.
Compilation failed in require at t/21nchar.t line 12.
BEGIN failed--compilation aborted at t/21nchar.t line 12.
t/21nchar.t ................... Dubious, test returned 2 (wstat 512, 0
+x200)
No subtests run
t/22nchar_al32utf8.t .......... Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/22nchar_al32utf8.t line 9.
Compilation failed in require at t/22nchar_al32utf8.t line 9.
BEGIN failed--compilation aborted at t/22nchar_al32utf8.t line 9.
t/22nchar_al32utf8.t .......... Dubious, test returned 2 (wstat 512, 0
+x200)
No subtests run
t/22nchar_utf8.t .............. Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/22nchar_utf8.t line 9.
Compilation failed in require at t/22nchar_utf8.t line 9.
BEGIN failed--compilation aborted at t/22nchar_utf8.t line 9.
t/22nchar_utf8.t .............. Dubious, test returned 2 (wstat 512, 0
+x200)
No subtests run
t/23wide_db.t ................. Can't load '/scripts/DBD-Oracle-1.74/b
+lib/arch/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: 
+perl: fatal: /opt/oracle/product/11g/db_1/lib/libclntsh.so.11.1: wron
+g ELF class: ELFCLASS64 at /cac/customperl/lib/5.20.1/sun4-solaris/Dy
+naLoader.pm line 193.
 at t/23wide_db.t line 9.
Compilation failed in require at t/23wide_db.t line 9.
BEGIN failed--compilation aborted at t/23wide_db.t line 9. etc etc
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not able to understand this error. could anyone please help?