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possibly undefined macro: AC_MSG_ERROR

... I had this same issue and found that pkg-config package was missing. After installing the package, everything generated correctly. share | ...
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Devise Secret Key was not set

... I ran bundle update this morning and started getting the same error. I added it as a line in config/initializers/devise.rb and the error was fixed. This seems to be the commit which introduced it. share ...
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CSS table layout: why does table-row not accept a margin?

... height of the DIV is solely determined by the height of the table-cell elements in it. Thus, margin, padding, and height on those elements have no effect. http://www.w3.org/TR/CSS2/tables.html share | ...
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How do I horizontally center an absolute positioned element inside a 100% width div? [duplicate]

...ader . Normally, I would do a margin:0 auto for relatively positioned elements but I am stuck here. Can someone show me the way? ...
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What is the recommended way to use Vim folding for Python code

...nally I can't convince myself to litter my code with the markers. I've become pretty used to (and efficient) at using indent-folding. Together with my mapping of space bar (see below) to open/close folds and the zR and zM commands, I'm right at home. Perfect for Python! set foldmethod=indent nnorema...
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How does UTF-8 “variable-width encoding” work?

...them all. That's what the UTF-32 encoding does. Yet the UTF-8 encoding somehow squeezes these into much smaller spaces by using something called "variable-width encoding". ...
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How do I remove all non alphanumeric characters from a string except dash?

How do I remove all non alphanumeric characters from a string except dash and space characters? 13 Answers ...
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What is std::move(), and when should it be used?

...uctors, objects can have move constructors. (And in addition to copy assignment operators, they have move assignment operators.) The move constructor is used instead of the copy constructor, if the object has type "rvalue-reference" (Type &&). std::move() is a cast that produces an rvalue-re...
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How do I loop through a list by twos? [duplicate]

I want to loop through a Python list and process 2 list items at a time. Something like this in another language: 7 Answers...
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How do I make background-size work in IE?

...:DXImageTransform.Microsoft.AlphaImageLoader( src='images/logo.gif', sizingMethod='scale'); -ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader( src='images/logo.gif', sizingMethod='scale')"; However, this scales the entire image to fit in the allocated area, so if you're using a spri...