Upstream ships only a Makefile with no install target, so each image compiles src/proxy_protocol.c with -fPIC, archives it into libproxyprotocol.a, and installs the header manually, matching this project's static-PIC-library convention. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016Xj6cCTEVsr5PM43uTsbq8