If none of gksu, kdesu, kde4su, ktsuss, or sudo are installed, then starting "Zenmap (as root)" from the start menu fails. This occurrs with both nmap versions in portage right now (4.76 and 4.85_beta7). The fix is to change the upper case "C" in line 48 of /usr/share/zenmap/su-to-zenmap.sh to lower case. Thanks, Henry Reproducible: Always Steps to Reproduce:
Created attachment 189398 [details, diff] su-to-zenmap.sh.diff Henry's suggestion in handy patch form :)
Fixed in CVS, thanks for the patch!