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Asked: 2026-05-28T04:14:43+00:00

After adding the link options: -lssl and -lcrypto, my program was correctly compiled. However,

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After adding the link options: -lssl and -lcrypto, my program was correctly compiled.
However, I found GCC doesn’t include the two options, so where do the options come from?

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1 Answer

  1. Editorial Team

    The GCC documentation tells us that -l is the option to link with a library.

    -llibrary
-l library
Search the library named library when linking. (The second alternative with the
library as a separate argument is only for POSIX compliance and is not
recommended.)

    So you’re telling gcc to link with the libraries “ssl” and “crypto”. These libraries are typically installed in /usr/lib. On Linux they’ll be called libssl.so and libcrypto.so. On OS X they’ll be called libssl.dylib and libcrypto.dylib.

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