what is implied by using the -L in gcc flag in gcc post-ceded by a dot

psp-gcc -I. -IC:/pspsdk/psp/sdk/include -O2 -G0 -Wall -D_PSP_FW_VERSION=150  -L. -LC:/pspsdk/psp/sdk/lib   main.o  -lpspdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lc -lpspnet -lpspnet_inet -lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkernel -o controller_basic.elf

it uses -I.

and it also uses -L.

note the dot after each of them, that is not a grammar dot, but a dot within the command itself, that i have no idea what it does, and i doubt i will find anything on the official docs without spending days reading through it