Even the 2018 edition of The Open Group Base Specifications Issue 7 [1] doesn't name -E as a standard option; only Issue 8 [2] does. As there's nothing "extended" about the expression used, simply drop the -E.
[1] https://pubs.opengroup.org/onlinepubs/9699919799/ [2] https://pubs.opengroup.org/onlinepubs/9799919799/ Fixes: cb50e4033717 ("test/pdx: add PDX compression unit tests") Signed-off-by: Jan Beulich <[email protected]> --- In principle the -e could be dropped too, for being redundant. Hitting the problem with an older sed pointed out another problem here as well: The failed invocation left a 0-byte pdx.h, which upon re-invocation of make was (obviously) deemed up-to-date, thus causing the build to fail again (until the bad file was actually removed). --- a/tools/tests/pdx/Makefile +++ b/tools/tests/pdx/Makefile @@ -35,7 +35,7 @@ uninstall: $(RM) -- $(patsubst %,$(DESTDIR)$(LIBEXEC)/tests/%,$(TARGETS)) pdx.h: $(XEN_ROOT)/xen/include/xen/pdx.h - sed -E -e '/^#[[:space:]]*include/d' <$< >$@ + sed -e '/^#[[:space:]]*include/d' <$< >$@ CFLAGS += -D__XEN_TOOLS__ CFLAGS += $(APPEND_CFLAGS)
