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I installed boost using sudo apt-get install on Ubuntu. Later I did not have to give gcc the I flag alongwith the path to the boost libraries to use boost ! Nor did I do any pkg-config --cflags --libs of any sort. What is the mystery here ? How is gcc able to know where boost is and how is it linking to it automatically ?

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up vote 10 down vote accepted

Boost is a mostly header-only library, so there is no library to link with (most of the time).

As for the headers, Ubuntu place them in /usr/include/, which is one of the include paths GCC use by default. So any #include <boost/foreach.hpp> will work out of the box on Ubuntu.

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additionally, the lib files are stored in the /usr/lib folder by default –  Wildling Mar 3 '13 at 17:10
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@RitwikG: Yes, but you still need to link to them explicitly. –  BatchyX Mar 3 '13 at 17:12

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