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Unable to install gem - Failed to build gem native extension - cannot load such file — mkmf (LoadErr
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`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,...
Django migration strategy for renaming a model and relationship fields
...pdate the names where it's imported e.g. admin.py and even older migration files (!).
Update: As ceasaro mentions, newer versions of Django are usually able to detect and ask if a model is renamed. So try manage.py makemigrations first and then check the migration file.
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What is the use case of noop [:] in bash?
...y, you are just making the shell do extra work in expanding * to a list of files in the current directory; it won't actually affect how the script works.
– chepner
Nov 5 '14 at 14:48
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Can I use a hash sign (#) for commenting in PHP?
I have never, ever, seen a PHP file using hashes ( # ) for commenting. But today I realized that I actually can! I'm assuming there's a reason why everybody uses // instead though, so here I am.
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Seeing escape characters when pressing the arrow keys in python shell
...STARTUP variable is defined, for me it points to /etc/pythonstart and that file is executed by the python process before going interactive, which setups readline/history handling.
Thanks to @chown here is the docs on this: http://docs.python.org/2/tutorial/interactive.html
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Exclude folder from search but not from the project list
...lace in Path.
I suggest to reorganize your folders, so that no unnecessary files are left in project directory. Also, you can specify Source Root by going to Settings > Project Settings > Directories and adding additional directories.
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How to use the CSV MIME-type?
...n a web application I am working on, the user can click on a link to a CSV file. There is no header set for the mime-type, so the browser just renders it as text. I would like for this file to be sent as a .csv file, so the user can directly open it with calc, excel, gnumeric, etc.
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How to auto-indent code in the Atom editor?
...ou could try to add a key mapping (Atom > Open Your Keymap [on Windows: File > Settings > Keybindings > "your keymap file"]) like this one:
'atom-text-editor':
'cmd-alt-l': 'editor:auto-indent'
It worked for me :)
For Windows:
'atom-text-editor':
'ctrl-alt-l': 'editor:auto-ind...
Xcode suddenly stopped running project on hardware: “Could not launch xxx.app: .. No such file..” [c
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Try deleting "Required device capabilities" in the -Info.plist file.
You can't require armv7 on a 3G, and you can't require armv6 on any newer device, so just delete this attribute entirely.
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Remove sensitive files and their commits from Git history
I would like to put a Git project on GitHub but it contains certain files with sensitive data (usernames and passwords, like /config/deploy.rb for capistrano).
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