How to detect the version of a installed perl module during portbuild

[Olli Hauer]

On 2012-01-03 21:52, Olli Hauer wrote:
> Hi,
> 
> I'm searching a solution to detect the version of p5-JSON-RPC during build time.
> 
> JSON-RPC-1.01 is *not* backward compatible to 0.96 so I have to apply a fix to the port only if JSON-RPC > 0.96 is installed.
> 
> 
>>From http://cpansearch.perl.org/src/DMAKI/JSON-RPC-1.01/Changes
> 1.00_01  2011 Nov 16
>     - If you are using old JSON::RPC code (up to 0.96), DO NOT EXPECT
>       YOUR CODE TO WORK. THIS VERSION IS BACKWARDS *INCOMPATIBLE*
> ...................................................^^^^^^^^^^^^^^
> 

Thanks for all the suggestions ;)

Meanwhile the following solutions was suggested from upstream (will be implemented as patch in the port)

-use base qw(JSON::RPC::Server::CGI);
+BEGIN {
+    eval { require JSON::RPC::Server::CGI; };
+    if ($@) {
+        require JSON::RPC::Legacy::Server::CGI;
+        our @ISA = qw(JSON::RPC::Legacy::Server::CGI);
+    }
+    else {
+        our @ISA = qw(JSON::RPC::Server::CGI);
+    }
+}


--
 olli