Eclipse Juno with CDT Doesn't Add Built-in Include Directories

Question

Since I upgraded from Eclipse Indigo to Juno (on Ubuntu 12.04), I\'ve been having the problem where it shows \"unresolved inclusion\" errors for standard libraries (e.g. next to

Answer 1

Please

• Open the Eclipse Preferences dialog (Windows | Preferences).
• Open C++ | Build | Settings.
• Open the Discovery tab.
• Select the built-in compiler settings entry.
• Press the Clear Entries button.

Afterwards eclipse should request the defaults again from the compiler.

On Arch Linux I had to do this after each GCC version change, because in that case the locations for the defaults changed as the version is encoded in the folder name, and eclipse does not notice this.