Always verify the tarball signature. OpenSSL provides .asc signature files. Import the OpenSSL project key and verify:

Use pkg-config or explicitly set CFLAGS and LDFLAGS :

./Configure --prefix=/opt/openssl-3.3.0 --openssldir=/opt/openssl-3.3.0/ssl shared linux-x86_64 (Replace linux-x86_64 with your platform: darwin64-arm64-cc for Apple Silicon, mingw64 for Windows cross-compile) # Build (use -jN for parallel jobs, e.g., -j4 for 4 cores) make -j$(nproc) Run the test suite (highly recommended before installing) make test

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