cat << EOF | patch -p0
+++ src/makefile.unix
@@ -38,6 +38,7 @@
    -l boost_filesystem\$(BOOST_LIB_SUFFIX) \\
    -l boost_program_options\$(BOOST_LIB_SUFFIX) \\
    -l boost_thread\$(BOOST_LIB_SUFFIX) \\
+   -l boost_chrono\$(BOOST_LIB_SUFFIX) \\
    -l db_cxx\$(BDB_LIB_SUFFIX) \\
    -l ssl \\
    -l crypto
EOF

sha1sum -c << EOF
9928c39fc2d593e2e83a55e51eecf7b9608c78fc *src/makefile.unix
EOF