Error: Failed to build gdb: command execution failed

[dbl001 (dbl)]

OS X 10.11.6

$ sudo port upgrade outdated
--->  Computing dependencies for gdb
--->  Fetching archive for gdb
--->  Attempting to fetch gdb-8.2.1_0.darwin_15.x86_64.tbz2 from https://packages.macports.org/gdb
--->  Attempting to fetch gdb-8.2.1_0.darwin_15.x86_64.tbz2 from http://sea.us.packages.macports.org/macports/packages/gdb
--->  Attempting to fetch gdb-8.2.1_0.darwin_15.x86_64.tbz2 from http://ywg.ca.packages.macports.org/mirror/macports/packages/gdb
--->  Fetching distfiles for gdb
--->  Attempting to fetch gdb-8.2.1.tar.gz from http://mirrors.ibiblio.org/gnu/ftp/gnu/gdb
--->  Verifying checksums for gdb                                               
--->  Extracting gdb
--->  Configuring gdb
--->  Building gdb
Error: Failed to build gdb: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_gdb/gdb/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.