i did it from the toolchains/m68k-unknown-amigaos/builddir because from toolchains/m68k-unknown-amigaos/ it gives me:
make: *** Keine Regel, um »install« zu erstellen. Schluss.
(no rule to make install)
its a mystery to me as well, just currently i need to look at how can i get the tools in /opt/netsurf/m68k-unknown-amigaos/cross/bin executable from bash at all before i can progress, thats the kind of problems over here, sorry.