$> sudo port install mysql55
Warning: The Xcode Command Line Tools don't appear to be installed; most ports will likely fail to build.
Warning: Install them by running `xcode-select --install'.
--->  Computing dependencies for mysql55
--->  Fetching archive for mysql55
--->  Attempting to fetch mysql55-5.5.44_1.darwin_15.x86_64.tbz2 from http://sea.us.packages.macports.org/macports/packages/mysql55
--->  Attempting to fetch mysql55-5.5.44_1.darwin_15.x86_64.tbz2 from http://packages.macports.org/mysql55
--->  Attempting to fetch mysql55-5.5.44_1.darwin_15.x86_64.tbz2 from http://fco.it.packages.macports.org/mirrors/macports-packages/mysql55/mysql55
--->  Fetching distfiles for mysql55
--->  Verifying checksums for mysql55
--->  Extracting mysql55
--->  Applying patches to mysql55
--->  Configuring mysql55
--->  Building mysql55
Error: org.macports.build for port mysql55 returned: command execution failed
Please see the log file for port mysql55 for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_databases_mysql55/mysql55/main.log
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
Error: Processing of port mysql55 failed