Error: Failed to build bazel: command execution failed

[dbl001 (dbl)]

debug:sysinfo OS X 10.11 (darwin/15.6.0) arch i386
:debug:sysinfo MacPorts 2.5.4
:debug:sysinfo Xcode 8.2
:debug:sysinfo SDK 10.11
:debug:sysinfo MACOSX_DEPLOYMENT_TARGET: 10.11
$ gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

info:build ^M[[1A^{[[Kgcc: error: unrecognized command line option '-fobjc-link-runtime'}

$ sudo port upgrade outdated
--->  Computing dependencies for bazel
--->  Fetching archive for bazel
--->  Attempting to fetch bazel-0.26.1_0.darwin_15.x86_64.tbz2 from https://packages.macports.org/bazel
--->  Attempting to fetch bazel-0.26.1_0.darwin_15.x86_64.tbz2 from http://sea.us.packages.macports.org/macports/packages/bazel
--->  Attempting to fetch bazel-0.26.1_0.darwin_15.x86_64.tbz2 from http://ywg.ca.packages.macports.org/mirror/macports/packages/bazel
--->  Fetching distfiles for bazel
--->  Attempting to fetch bazel-0.26.1-dist.zip from https://distfiles.macports.org/bazel
--->  Verifying checksums for bazel                                             
--->  Extracting bazel
--->  Configuring bazel
--->  Building bazel
Error: Failed to build bazel: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_bazel/bazel/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.