Following these instructions, I got the following errors:

Trying to find an ORACLE_HOME
Found /Library/Oracle/instantclient_11_2

WARNING: Setting ORACLE_HOME env var to /Library/Oracle/instantclient_
+11_2 for you.
WARNING: If these tests fail you may have to set ORACLE_HOME yourself!
Installing on a darwin, Ver#12.0
Using Oracle in /Library/Oracle/instantclient_11_2
Use of uninitialized value $sqlplus_release in pattern match (m//) at 
+Makefile.pl line 1626.
Use of uninitialized value $sqlplus_release in print at Makefile.pl li
+ne 1635.
Use of uninitialized value $sqlplus_release in pattern match (m//) at 
+Makefile.pl line 1636.

        If sqlplus failed due to a linker/symbol/relocation/library er
+ror or similar problem
        then it's likely that you've not configured your environment c
+orrectly.
        Specifically, your DYLD_LIBRARY_PATH environment variable
        set to include the directory containing the Oracle libraries.
        
I'm having trouble finding your Oracle version number... trying harder

WARNING: I could not determine Oracle client version so I'll just
default to version 8.0.0.0. Some features of DBD::Oracle may not work.
Oracle version based logic in Makefile.PL may produce erroneous result
+s.
You can use "perl Makefile.PL -V X.Y.Z" to specify a your client versi
+on.

Oracle version 8.0.0.0 (8.0)
DBD::Oracle no longer supports Oracle client versions before 9.2 
 Try a version before 1.25 for 9 and 1.18 for 8! at Makefile.pl line 2
+71.
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