Anyone else run into this on Sid very recently? Any hints or pointers?
Yup.
Providing some compile flags in:
/usr/src/linux/Makefile
around line 614 fixed it for me.
614 # force no-pie for distro compilers that enable pie by default
615 KBUILD_CFLAGS += $(call cc-option, -fno-pie)
616 KBUILD_CFLAGS += $(call cc-option, -no-pie)
617 KBUILD_AFLAGS += $(call cc-option, -fno-pie)
618 KBUILD_CPPFLAGS += $(call cc-option, -fno-pie)
After that, dkms succeeded and no further problems ... so far.
Regards
Dirk