[sschmitt] ~> sudo port install gdb
--->  Computing dependencies for gdb
--->  Fetching archive for gdb
--->  Attempting to fetch gdb-7.9.1_3.darwin_15.x86_64.tbz2 from http://nue.de.packages.macports.org/macports/packages/gdb
--->  Attempting to fetch gdb-7.9.1_3.darwin_15.x86_64.tbz2 from http://lil.fr.packages.macports.org/gdb
--->  Attempting to fetch gdb-7.9.1_3.darwin_15.x86_64.tbz2 from http://mse.uk.packages.macports.org/sites/packages.macports.org/gdb
--->  Fetching distfiles for gdb
--->  Verifying checksums for gdb
--->  Extracting gdb
--->  Configuring gdb
--->  Building gdb
--->  Staging gdb into destroot
--->  Installing gdb @7.9.1_3
--->  Activating gdb @7.9.1_3

You will need to make sure
/System/Library/LaunchDaemons/com.apple.taskgated.plist has the '-p' option,
e.g.
            <key>ProgramArguments</key>
     <array>
             <string>/usr/libexec/taskgated</string>
             <string>-sp</string>
     </array>


Due to kernel caching, you usually need to restart Mac OS X for this option to
effect.

--->  Cleaning gdb
--->  Updating database of binaries
--->  Scanning binaries for linking errors
--->  No broken files found.
[sschmitt] ~> gdb
bash: gdb: command not found
[sschmitt] ~> which gdb
[sschmitt] ~>