Emerging arp-sk-0.0.16-r2 makes it error out very early because the AM_CONFIG_HEADER macro in configure.in is obsolete.
Attached patch to fix this
Steps to Reproduce:
Emerge errors out with "failed to run aclocal"
Successful emerge of net-analyzer/arp-sk
Created attachment 353218 [details, diff]
Patch to configure.in to replace obsolete macro
Created attachment 353220 [details, diff]
Patch to ebuild to apply patch
Fixed without a revision bump. Thanks for the report!