origins depends

devel/svn2git git-1.8.0.2
ports-mgmt/portshaker git-1.8.0.2
shells/bash-completion bash-static-4.2.37
www/wgetpaste bash-static-4.2.37
local/base-meta bash-static-4.2.37
local/base-meta git-1.8.0.2
local/bootstrap-meta bash-static-4.2.37
local/bootstrap-meta git-1.8.0.2
local/dev-meta git-1.8.0.2
local/dev-ports-meta git-1.8.0.2
local/dns-slave-meta git-1.8.0.2
local/fileserver-meta git-1.8.0.2
local/mail-meta git-1.8.0.2
local/nagios-meta git-1.8.0.2
local/shell-meta bash-static-4.2.37
local/shell-meta git-1.8.0.2
local/web-meta git-1.8.0.2

wanted output

devel/svn2git git-1.8.0.2
local/base-meta bash-static-4.2.37 git-1.8.0.2
local/dev-ports-meta git-1.8.0.2
local/dev-meta git-1.8.0.2
shells/bash-completion bash-static-4.2.37
local/fileserver-meta git-1.8.0.2
ports-mgmt/portshaker git-1.8.0.2
local/mail-meta git-1.8.0.2
local/nagios-meta git-1.8.0.2
local/web-meta git-1.8.0.2
local/dns-slave-meta git-1.8.0.2
www/wgetpaste bash-static-4.2.37
local/shell-meta bash-static-4.2.37 git-1.8.0.2
local/bootstrap-meta bash-static-4.2.37 git-1.8.0.2

This creates the expected output

awk '{ if (a[$1]) a[$1]=a[$1] " " $2; else a[$1]=$2;} END { for (i in a) print i, a[i];}'