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Some common include directories that come pre-defined with GCC are:

• /usr/include
• /usr/local/include
• /usr/include/c++/<version>
• /usr/include/c++/<version>/<architectute>
• /usr/include/sys
• /usr/include/netinet
• /usr/include/arpa
• /usr/include/openssl
• /usr/include/ncurses

Note: The actual include directories may vary depending on the operating system and GCC version.