-export ZDOTDIR=${CURDIR}/tests/ZDOTDIR
+# Default, can be overridden using "make test ZDOTDIR=...".
+ZDOTDIR:=${CURDIR}/tests/ZDOTDIR
+
+# Export it, and make it absolute.
+override export ZDOTDIR:=$(abspath $(ZDOTDIR))
test:
cram --shell=zsh -v tests