--- runtime/ftplugin/ada.vim	2008-04-05 21:10:42.461961940 +0300
+++ runtime/ftplugin/ada.vim	2008-04-05 21:14:58.176962142 +0300
@@ -106,9 +106,11 @@
 
 " Section: Compiler {{{1
 "
-if ! exists("current_compiler")			||
-   \ current_compiler != g:ada_default_compiler
-   execute "compiler " . g:ada_default_compiler
+if exists("g:ada_default_compiler")
+   if ! exists("current_compiler")  || 
+	    \ current_compiler != g:ada_default_compiler
+      execute "compiler " . g:ada_default_compiler
+   endif
 endif
 
 " Section: Folding {{{1