www/opera interpreter

[Frédéric Fauberteau <triaxx%NetBSD.org@localhost>]

I try to run www/opera but I get the following error message:
exec: /usr/pkg/lib/opera/opera: not found

$ file /usr/pkg/lib/opera/opera
/usr/pkg/lib/opera/opera: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=5463b6aabe4f635f6496129b9529e005ce29c4e5, stripped

$ ls -l /usr/pkg/emul/linux/lib64/ld-linux-x86-64.so.2 
lrwxr-xr-x  1 root  wheel  10 Apr 21 09:55 /usr/pkg/emul/linux/lib64/ld-linux-x86-64.so.2@ -> ld-2.18.so

I probably omitted something. Is there a mechanism provided by pkgsrc for the opera binary to find the correct interpreter in the /usr/pkg/emul/linux tree?