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Error installing mysql2: Failed to build gem native extension

I am having some problems when trying to install mysql2 gem for Rails. When I try to install it by running bundle install or gem install mysql2 it gives me the following error: ...
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Make absolute positioned div expand parent div height

As you can see in the CSS below, I want child2 to position itself before child1 . This is because the site I'm currently developing should also work on mobile devices, on which the child2 should be at the bottom, as it contains the navigation which I want below the content on the mobile devices...
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How to disable HTML button using JavaScript?

... For some reason this worked for me even though $('#btnPlaceOrder').disabled = false; doesn't. – levininja Dec 22 '14 at 19:51 ...
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PHP Sort a multidimensional array by element containing date

...negative value if the second argument ($b) is larger. usort() uses this information to sort the array. share | improve this answer | follow | ...
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creating a strikethrough text?

...intFlags(someTextView.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); For painting text, there are several bit flags for doing things like bold, italics, and yes strikethrough. So to enable the strikethrough, you need to flip the bit that corresponds to this flag. The easiest way to do th...
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When exactly are onSaveInstanceState() and onRestoreInstanceState() called?

...te (Bundle outState) If called, this method will occur after onStop() for applications targeting platforms starting with Build.VERSION_CODES.P. For applications targeting earlier platform versions this method will occur before onStop() and there are no guarantees about whether it will occur bef...
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What is the difference between ExecuteScalar, ExecuteReader and ExecuteNonQuery?

...An example might be SELECT @@IDENTITY AS 'Identity'. ExecuteReader is used for any result set with multiple rows/columns (e.g., SELECT col1, col2 from sometable). ExecuteNonQuery is typically used for SQL statements without results (e.g., UPDATE, INSERT, etc.). ...
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Check play state of AVPlayer

... To get notification for reaching the end of an item (via Apple): [[NSNotificationCenter defaultCenter] addObserver:<self> selector:@selector(<#The selector name#>) name:AVPlayerItemDidPlayToEndTimeNotification ...
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Storing custom objects in an NSMutableArray in NSUserDefaults

...llection. I also use this to save user registration info successfully, but for some reason trying to store my NSMutableArray of custom Location classes always comes back empty. ...
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Default profile in Spring 3.1

... @andih Yes, I know that, but I only say it's not intuitive and therefore problematic. Since application-default.properties get loaded, I also expect that application-newdefault.properties will be loaded as well. It's not a problem with your solution, it's a problem with Spring... ...