From: Joel VanderWerf <joelvanderwerf@...>
Date: 2011-11-30T08:36:15+09:00
Subject: [ruby-core:41400] Re: conflict between 1.8.7 and 1.9.3 installations

On 11/29/2011 01:19 PM, Jeremy Evans wrote:
> On 11/30 05:58, Joel VanderWerf wrote:
>> On 11/19/2011 07:15 PM, Joel VanderWerf wrote:
>>> On 11/19/2011 04:55 PM, Nobuyoshi Nakada wrote:
>>>> ./configure --program-transform=s/$/19/
>>
>> Unfortunately, rubygems doesn't seem to abide by this config.
>>
>> These two commands:
>>
>>   gem install sequel
>>   gem19 install sequel
>>
>> both try to install the sequel executable to /usr/local/bin/sequel.
>>
>> Is this a bug in rubygems?
>
> No.  You can use the --format-executable option so that gem19 install
> sequel installs /usr/local/bin/sequel19.

Ah, I see, thanks. And presumably this switch would also be needed for 
each update as well:

$ gem help update | grep format
         --[no-]format-executable     Make installed executable names 
match ruby.