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Unable to install gem - Failed to build gem native extension - cannot load such file — mkmf (LoadErr
... 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:
sudo apt-get install ruby1.9.1-dev
Should fix your problem.
Still not working? Try the following after installing ruby-dev:
sudo apt-get i...
Center Google Maps (V3) on browser resize (responsive)
...browser window's width I would like the map to stay centered (responsive). Now the map just stays at the left side of the page and gets smaller.
...
What is the size of ActionBar in pixels?
...height of the ActionBar in XML, just use
?android:attr/actionBarSize
or if you're an ActionBarSherlock or AppCompat user, use this
?attr/actionBarSize
If you need this value at runtime, use this
final TypedArray styledAttributes = getContext().getTheme().obtainStyledAttributes(
...
How to determine MIME type of file in android?
...null;
String extension = MimeTypeMap.getFileExtensionFromUrl(url);
if (extension != null) {
type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
}
return type;
}
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How to exit pdb and allow program to continue?
...d show
something like: (pdb) .....
- switch back to pdb, then press Enter, now you are all set, pdb command
shell reappear again
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Storing R.drawable IDs in XML array
...e));
where index is the Drawable index.
defaultValue is a value you give if there is no item at this index
For more information about TypedArray visit this link
http://developer.android.com/reference/android/content/res/TypedArray.html
...
Making your .NET language step correctly in the debugger
...
I am an engineer on the Visual Studio Debugger team.
Correct me if I am wrong, but it sounds like the only issue left is that when switching from PDBs to the .NET 4 dynamic compile symbol format some breakpoints are being missed.
We would probably need a repro to exactly diagnose the iss...
How to enter command with password for git pull?
...helper to honor XDG configuration file locations when specified.
The doc now say:
If not specified:
credentials will be searched for from ~/.git-credentials and $XDG_CONFIG_HOME/git/credentials, and
credentials will be written to ~/.git-credentials if it exists, or $XDG_CONFIG_HOME/...
iPhone App 开发第一步：从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...
...机器（intel已经可以装lion了，此处不再讨论），应用darwin_snow_legacy.iso，进行引导，之后一路安装直至成功；
（2）安装完成后，装VMTools实现共享，以及声卡驱动；（3）之后要对系统进行升级（我是从10.6升级至10.6.7），升...
How to avoid “Permission denied” when using pip with virtualenv
...
if I want to create it in /opt which requires sudo, I think virtualenv won't install without sudo.
– Umair A.
Dec 12 '13 at 13:10
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