urbanadventurer
commented
3 years ago Thanks @bfontaine 👍
The ?= syntax was new to me, so I'll make this note here for others:
- ?= indicates to set the KDIR variable only if it's not set/doesn't have a value.
- https://www.gnu.org/software/make/manual/html_node/Setting.html
With this change, one can run
make install PREFIX=/my/custom/prefix.