% perlbrew install -v perl-5.8.9
...
DB_File.xs:998:34: error: incompatible function pointer types assigning to 'u_int32_t (*)(const void *, size_t)' (aka 'unsigned int (*)(const void *, unsigned long)') from 'int (const void *, size_t)' (aka 'int (const void *, unsigned long)') [-Wincompatible-function-pointer-types]
                info->db_HA_hash = hash_cb ;
                                 ^ ~~~~~~~
DB_File.xs:1041:36: error: incompatible function pointer types assigning to 'size_t (*)(const DBT *, const DBT *)' (aka 'unsigned long (*)(const DBT *, const DBT *)') from 'int (const DBT *, const DBT *)' [-Wincompatible-function-pointer-types]
                info->db_BT_prefix = btree_prefix ;
                                   ^ ~~~~~~~~~~~~
...
308 warnings and 2 errors generated.
make[1]: *** [DB_File.o] Error 1
make: *** [lib/auto/DB_File/DB_File.bundle] Error 2
perl-5.8.9 is successfully installed.

% perlbrew list
* perl-5.42.0                               
  perl-5.38.2   

% perlbrew install -v perl-5.24.4
...
# Failed test 25 - SHA for cpan/ExtUtils-MakeMaker/lib/ExtUtils/Liblist/Kid.pm matches stashed SHA at porting/customized.t line 105
#      got "47d2fdf890d7913ccd0e32b5f98a98f75745d227"
# expected "bfd2aa00ca4ed251f342e1d1ad704abbaf5a615e"
porting/customized.t .............................................. 
Failed 1/181 subtests 
...
Test Summary Report
-------------------
porting/customized.t                                            (Wstat: 0 Tests: 181 Failed: 1)
  Failed test:  25
porting/libperl.t                                               (Wstat: 7424 Tests: 0 Failed: 0)
  Non-zero exit status: 29
  Parse errors: No plan found in TAP output
Files=2410, Tests=850611, 515 wallclock secs (11.99 usr  2.72 sys + 134.39 cusr 16.64 csys = 165.74 CPU)
Result: FAIL
make: *** [test_harness] Error 1
perl-5.24.4 is successfully installed.

% perlbrew list                       
* perl-5.42.0                               
  perl-5.38.2