icetime: icetime.cc:230: void read_pcf(const char*): Assertion `args.size() == 2' failed.

[Harvie]

I can't flash icebreaker:

$ make BOARD=icebreaker flash
icetime -t -m -d up5k -P sg48 -p boards/icebreaker.pcf -c 16 -r top.rpt top_syn.asc
// Reading input .pcf file..
icetime: icetime.cc:230: void read_pcf(const char*): Assertion `args.size() == 2' failed.
make: *** [arch/ice40.mk:38: top.rpt] Aborted (core dumped)

i've tried two different versions of icetime. git that i've compiled myself. and staticaly linked binary that comes with icestudio. none of these worked...