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https://issues.apache.org/jira/browse/SVN-4654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15501087#comment-15501087
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Branko ─îibej commented on SVN-4654:
-----------------------------------

We use backticks because some older OSes (notably some versions of Solaris) 
don't have a shell that can use {{$()}}. Backticks are still "standard POSIX". 
It would be more interesting to understand why they don't work in your 
particular environment instead of just blindly replacing them and possibly 
breaking the build on some other platform.

> configure: command substitution for SVN_REMOVE_STANDARD_LIB_DIRS fails with 
> non-POSIX backticks on HP-UX
> --------------------------------------------------------------------------------------------------------
>
>                 Key: SVN-4654
>                 URL: https://issues.apache.org/jira/browse/SVN-4654
>             Project: Subversion
>          Issue Type: Bug
>          Components: compile, install
>    Affects Versions: 1.9.4, trunk
>         Environment: $ uname -a
> HP-UX blnn724x B.11.31 U ia64 HP-UX
>            Reporter: Michael Osipov
>         Attachments: SVN-4654.patch, configure.err.tar.gz
>
>
> When running {{configure}} on HP-UX, you see several times 
> {{./configure\[4880\]: : Execute permission denied.}} and 
> {{./configure\[4880\]: /lib64:  not found.}}.
> This is caused by having the command substitution perfomed by backticks 
> {{LDFLAGS="`SVN_REMOVE_STANDARD_LIB_DIR(...)`"}} and not with standard POSIX 
> {{$()}}.
> See attached trace output w/o patch and with patch applied.



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