In openssl 1.1 some functions were renamed to newer more consistent names. There are however preprocessor macros defined for most of them so that old code still compiles. One of the old functions that was renamed was SSL_library_init, which now is defined in /usr/include/openssl/ssl.h as # define SSL_library_init() OPENSSL_init_ssl(0, NULL) The configure.ac in dillo uses AC_CHECK_LIB to detect the presence of the openssl library like this: AC_CHECK_LIB(ssl, SSL_library_init, ssl_ok=yes, ssl_ok=no, -lcrypto) The AC_CHECK_LIB macro only checks for the presence of a symbol in the library and bypasses any definitions in the header files, so it is unaware of the preprocessor macro in the header file that redirects the call to SSL_library_init to a call to OPENSSL_init_ssl. And since SSL_library_init is no longer a proper symbol in the openssl library the check fails. This is easily fixed by replacing the check for SSL_library_init with a check for a function that hasn't changed name, see e.g. the change implemented in dcap: https://github.com/dCache/dcap/pull/12/files Mattias
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