Buildfile:build.xml does not exist - ant

I have installed Ant as i could use ant -version where it shows Apache Ant(TM) version 1.10.1 compiled on February 2 2017.i use Ubuntu 16.04 ,After I decompress voltdb,modify environment variables ,in terminal,import Ant.then the problem shows.maybe I need to illustrate I have never use it ,no data in voltdb.
I want to get it down.

the instructions for building VoltDB from source are here: https://github.com/VoltDB/voltdb/wiki/Building-VoltDB
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Unable to run 'tcl' file on Vivado 2016.4 version

I am trying to run a .tcl file originally configured for 2014.4 on 2016.4 version of Vivado. However I am getting the following error:
while executing
"create_bd_cell -type ip -vlnv xilinx.com:ip:mig mig_0 "
(procedure "create_root_design" line 111)
invoked from within
"create_root_design """
(file "all.tcl" line 405)
The tcl file uses the part 'xcku040-ffva1156-2' and tries to access the IP 'mig' which I believe is renamed/changed on later versions. Is there any workaround for this?
Steps I have done till now:
Changed the version number to 2016.4
tried replacing target boards.
tried on the same board with an alternate IP for mig.
tried on both 2016.4 and 2015.4 versions
None of these have worked so far
Attaching the '.tcl' file for reference : all.tcl
Since with every version upgrade of the Vivado Design Suite, parts are renamed or removed, it is not possible to run a .tcl file meant for an earlier version in newer releases. So I ran the above query on Xilinx Community Forums and found a workaround:
Run this script on the previous version(2014 in this case), generate the design and then open the same design using the next major release(2015 version). The 2015 version will automatically suggest upgrades to the discontinued/renamed IPs. Repeat the same to get to 2016 version. That's the only way to get this done. Also have to keep checking if the core functionality of the IP is the same after automated upgrades by Vivado Design Suite.

Imagemagick support for Ruby on Rails Windows

was trying to download Window Binary Release for ImageMagick installation in Windows 7 Rails 4.2.4 , Ruby 2.1.5.
however all the download links returned not found.
ImageMagick windows binary release link
Are there any alternative links to download the file so that a proper installation can be done?
I've just followed the link you provided, and tried:
http://www.imagemagick.org/download/binaries/ImageMagick-6.9.3-7-Q16-x64-dll.exe
ftp://ftp.imagemagick.org/pub/ImageMagick/binaries/ImageMagick-6.9.3-7-Q16-x64-dll.exe
and a couple of others, and they all started a download. It's either a temporary thing with that server, or if permanent, your setup. Machine/ISP/Country comes to mind.
https://www.imagemagick.org/script/download.php
Also provides some mirrors, I see the German one has windows binaries.

How to downgrade php from 5.6 to 5.5 on Fedora 21

I need to do the subject because I'm developing with the team on PHP 5.5, but my current Fedora version contains PHP 5.6.
I've found a Remi's repo contining PHP 5.5 for FC-21, installed it as described in "Install Howto" section. But I cannot run the Apache to use with PHP v.5.5. Please suggest what I can do to have desired?
you can try to downgrade your current installation using the packet manager by issuing the command yum downgrade php55 see downgrade or rollback updates, where you can also specify a specific version. Before that I suggest you to first verify your installation history about php if its is present.
Another way is to install the specific version you want see the answer here and then add a rule to block further updates in /etc/yum.conf see here for the blocking rule

Dealing with a large c++ library in a Rails deployment

I have a Rails project that is going to be using OpenCV, and it depends on a certain version of it (2.4.6.1).
I'm looking for deployment advice. The Ubuntu opencv package is an earlier version and therefore not suitable.
I can see a number of possibilities, but I'm trying to think of what will work best.
Just write it up in a README and expect people to follow it: download this, apt-get that, etc...
Add opencv, tagged at the version we need, as a git subtree, and include a Rake task to build it.
Write a script to download and compile the needed code.
Something else ?
None of them seem all that great, to tell the truth.
Can your application be made to work with OpenCV 2.4.2? That is available in Ubuntu 13.04, and you could request it be backported to 12.04. If not, you could update the source package to 2.4.6.1 (which would require learning about debian packaging but might not be too difficult since you would be modifying an existing package instead of starting from scratch), upload it to a PPA, and instruct your users on Ubuntu to install OpenCV from there. You could also package your rails application and put it in the PPA, which would make overall installation even easier.

Grails extension in SpringSource Tool Suite errors

I recently installed SpringSource Tool Suite. And I want to start working with Grails projects. So, I went to the Dashboard -> Extension, where I saw two extensions: Grails (current production release) and Grails Support as in the image below.
But when I try to install them, I get the following errors :
Problems occurred while performing installation: Operation details
Operation details
Cannot complete the install because one or more required items could not be found.
Software currently installed: Shared profile 1.0.0.1340820181092 (SharedProfile_com.springsource.sts.ide 1.0.0.1340820181092)
Missing requirement: Shared profile 1.0.0.1340820181092 (SharedProfile_com.springsource.sts.ide 1.0.0.1340820181092) requires 'org.maven.ide.eclipse [1.0.100.20110804-1717]' but it could not be found
What can I do to resolve this error ? Or are there any other options I can follow to install Grails extension?
Thank you!
I would switch to the new "Groovy/Grails Tool Suite" that was recently announced (see http://www.springsource.org/node/3582). Go to the standard download page at http://www.springsource.org/downloads/sts and click "Other Downloads >". Download the version for your OS under "Milestone Version - Groovy/Grails Tool Suite 3.0.0.M2".
It is a beta/milestone release but I've been using it since it was released and it's as stable as a final release so far. It's convenient since the Groovy-Eclipse plugin and the Grails support are already configured for you, in addition to the latest Grails (2.0.4). Any other plugins that you need from the standard STS can always be installed using the standard install/update procedure.
Yes, what #BurtBeckwith said. You should move to the new GGTS.
However, to address your particular problem, you installed STS into a read-only directory (or in C:\Program files). You need to re-install it somewhere else.
The Eclipse p2 installer cannot handle installing feature patches into a read-only directory. Groovy-Eclipse ships with a feature patch to extend the JDT compiler. I believe that this problem was fixed in the Juno release of Eclipse (4.2), which came out last week.
Deleting corresponding application from Windows memory removed the problem (Grails extension in SpringSource Tool Suite errors). Double running applications (earlier and new) could also be reason why GGS or STS sometimes cannot save .groovy files (with error message or without).

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