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Unable to install gem - Failed to build gem native extension - cannot load such file — mkmf (LoadErr
...ere are similar questions:
`require': no such file to load -- mkmf (LoadError)
Failed to build gem native extension (mkmf (LoadError)) - Ubuntu 12.04
Usually, the solution is:
sudo apt-get install ruby-dev
Or, if that doesn't work, depending on your ruby version, run something like:
s...
Setting the correct encoding when piping stdout in Python
...citly print with a given encoding every time. That would be repetitive and error-prone.
A better solution is to change sys.stdout at the start of your program, to encode with a selected encoding. Here is one solution I found on Python: How is sys.stdout.encoding chosen?, in particular a comment by ...
How can I copy & paste, or duplicate, an existing project?
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How to move screen without moving cursor in Vim?
I recently discovered Ctrl + E and Ctrl + Y shortcuts for Vim that respectively move the screen up and down with a one line step, without moving the cursor .
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How do I write the 'cd' command in a makefile?
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@Beta: well yes, and a dash prefix ignores the error status as well. Maybe I got a little carried away, I wanted to point out the fact that make does echos the command, regardless of what kind of command it is. And in this case, it's a command with no output, which makes ...
NullPointerException in Java with no StackTrace
...sing log4j. I discovered (inadvertently) a place where I had written
LOG.error(exc);
instead of the typical
LOG.error("Some informative message", e);
through laziness or perhaps just not thinking about it. The unfortunate part of this is that it doesn't behave as you expect. The logger API ...
How to change letter spacing in a Textview?
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This doesnt actually work when set in the XML. I get an error like this: "1.2dp" in attribute "letterSpacing" cannot be converted to float."
– dopatraman
Jan 16 '16 at 20:19
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Best practice: PHP Magic Methods __set and __get [duplicate]
..._$p";
if(method_exists($this, $m)) return $this->$m();
user_error("undefined property $p");
}
when someone calls $obj->xxx and the class has get_xxx defined, this method will be implicitly called. So you can define a getter if you need it, while keeping your interface uniform an...
How do I list all files of a directory?
... if p.is_file():
print(p)
flist.append(p)
>>> error.PNG
>>> exemaker.bat
>>> guiprova.mp3
>>> setup.py
>>> speak_gui2.py
>>> thumb.PNG
With list comprehension:
flist = [p for p in pathlib.Path('.').iterdir() if p.is_fi...
Setup RSpec to test a gem (not Rails)
...?
I am not using jeweler or such tools. I just used Bundler ( bundle gem my_gem ) to setup the structure for the new gem and edit the *.gemspec manually.
I also added s.add_development_dependency "rspec", ">= 2.0.0" to gemspec and did a bundle install .
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