sed's -E option may not be supported by older distros. As there's no point using sed here at all, use just shell mechanisms to establish the variable values, starting from the stem instead of the full target.
Signed-off-by: Jan Beulich <jbeul...@suse.com> --- a/Makefile +++ b/Makefile @@ -242,8 +242,7 @@ GENERATED_FILES += $(KEYCODEMAP_FILES) ui/input-keymap-%.c: $(KEYCODEMAP_GEN) $(KEYCODEMAP_CSV) $(SRC_PATH)/ui/Makefile.objs $(call quiet-command,\ - src=$$(echo $@ | sed -E -e "s,^ui/input-keymap-(.+)-to-(.+)\.c$$,\1,") && \ - dst=$$(echo $@ | sed -E -e "s,^ui/input-keymap-(.+)-to-(.+)\.c$$,\2,") && \ + stem=$* && src=$${stem%-to-*} dst=$${stem#*-to-} && \ test -e $(KEYCODEMAP_GEN) && \ $(PYTHON) $(KEYCODEMAP_GEN) \ --lang glib2 \