Error log:
[Tue Jun 17 12:08:35 2014] [error] [client 172.18.40.199] Perl v5.16.0 required--this is only v5.10.1, stopped at index.cgi line 2.
[Tue Jun 17 12:08:35 2014] [error] [client 172.18.40.199] BEGIN failed--compilation aborted at index.cgi line 2.
[Tue Jun 17 12:08:35 2014] [error] [client 172.18.40.199] Premature end of script headers: index.cgi
This is run as the user: 'support' and support runs perlbrew w/ switch set to 5.16.3 as shown below:
# su - support
print() on closed filehandle $fh at /loader/0x1cb94a8/App/perlbrew.pm line 19.
-bash-4.1$ perl -v
This is perl 5, version 16, subversion 3 (v5.16.3) built for x86_64-linux
What do I need to do to ensure Apache executes index.cgi w/ the perl installed by perlbrew?
The OS executes the interpreter identified by the shebang (#!) line of the script it was asked to execute (index.cgi). It's just a question of specifying the path to the interpreter you installed using perlbrew there.
Execute which perl (more familiar) or perl -E'say $^X' (more reliable?) to determine the value needed.
Let's do an example.
One on of my machines, I get the following when using my threaded build of 5.18.2. (You'll get something different.)
$ which perl
/home/ikegami/usr/perlbrew/perls/5.18.2t/bin/perl
$ perl -E'say $^X'
/home/ikegami/usr/perlbrew/perls/5.18.2t/bin/perl
So I'd use the following as the first line of index.cgi:
#!/home/ikegami/usr/perlbrew/perls/5.18.2t/bin/perl