Older gcc versions throw things like:
In file included from /usr/include/fcntl.h:302:0,
from ../src/core/execute.c:25:
In function 'open',
inlined from 'open_null_as' at ../src/core/execute.c:196:12:
/usr/include/bits/fcntl2.h:50:24: error: call to '__open_missing_mode'
declared with attribute error: open with O_CREAT in second argument needs 3 arguments
__open_missing_mode ();
--param=ssp-buffer-size=4])
AC_SUBST([OUR_CFLAGS], "$with_cflags $address_sanitizer_cflags")
-AS_CASE([$CFLAGS], [*-O[[12345g\ ]]*],
+AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
[CC_CHECK_FLAGS_APPEND([with_cppflags], [CPPFLAGS], [\
-Wp,-D_FORTIFY_SOURCE=2])],
[AC_MSG_RESULT([skipping -D_FORTIFY_SOURCE, optimization not enabled])])