I have a `.gvimrc` file that works fine on OS X 10.6, but won't work on Ubuntu. It contains a line that reads `set transparency=15`, and when i run gVim it reports:

```
Error detected while processing /home/user/.gvimrc: 
line   25: 
E518: Unknown option: transparency=15

```

Any ideas to make gVim transparent by default?

Chers!

The whole `.gvimrc` file for completion:

```
" Turn on line numbers
set number

" Change colorscheme
colorscheme ir_black

" Turns on the tab bar always
set showtabline=2

" Number of horizontal lines on the screen
set lines=60

" GUI Option to remove the Toolbar (T)
set guioptions-=T

" Sets the percent transparency
set transparency=15

```