bug#25299: '@' character in installation prefix breaks automake-1.15

I can reproduce this issue. This will be triggered by the pipeline plugin of jenkins when building in parallel. The additional workspaces are postfixed by '@1', '@2' ...

bug#25299: '@' character in installation prefix breaks automake-1.15

Configuring automake to install to a path containing a '@' character breaks the compilation as shown in the attached typescripts. We found that we were able to work around the bug with the following patch: diff --git a/bin/aclocal.in b/bin/aclocal.in index 349f24a2..c8ab8b3e 100644 --- a/bin/acl