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Error while installing json gem 'mkmf.rb can't find header files for ruby'
...ll ruby2.0-dev
sudo apt-get install ruby2.2-dev
sudo apt-get install ruby2.3-dev
or, generic way:
sudo apt-get install ruby-dev
or
sudo apt-get install ruby`ruby -e 'puts RUBY_VERSION[/\d+\.\d+/]'`-dev
The first link you’ve posted is exactly your case: there is no ruby development...
Simple basic explanation of a Distributed Hash Table (DHT)
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3 Answers
3
Active
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Keyboard shortcut to comment lines in Sublime Text 3
...u Edit > Comment these shortcuts should be valid, but in Sublime Text 3 (build 3047) they no longer seem to work. Does anybody know the right default keyboard shortcuts for Linux and MacOS? Or is it a bug?
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Using helpers in model: how do I include helper dependencies?
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134
Just change the first line as follows :
include ActionView::Helpers
that will make it works....
How to programmatically display version/build number of target in iOS app?
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394
There are 2 Numbers!
The marketing release number is for the customers, called version number...
Find and replace string values in list
... a float/integer?
– Patriots299
Dec 31 '18 at 20:38
add a comment
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Generate a UUID on iOS from Swift
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635
Try this one:
let uuid = NSUUID().uuidString
print(uuid)
Swift 3/4/5
let uuid = UUID().uuid...
How to cast int to enum in C++?
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answered Jul 12 '12 at 13:33
AndrewAndrew
22.2k99 gold badges5454 silver badges8585 bronze badges
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Is it necessary to explicitly remove event handlers in C#
...Subscriber.FooHandler()
Raising Foo
No handlers
(Tested on Mono and .NET 3.5SP1.)
Further edit:
This is to prove that an event publisher can be collected while there are still references to a subscriber.
using System;
public class Publisher
{
~Publisher()
{
Console.WriteLine("~...
Return only string message from Spring MVC 3 Controller
...)
@ResponseBody
public String foo() {
return "Response!";
}
From: 15.3.2.6 Mapping the response body with the @ResponseBody annotation:
The @ResponseBody annotation [...] can be put on a method and indicates that the return type should be written straight to the HTTP response body (and not...