Depends-on:
stdio
-vasnprintf
-full-write
-errno
+vasnprintf [test $ac_cv_func_vdprintf = no || test $REPLACE_VDPRINTF = 1]
+full-write [test $ac_cv_func_vdprintf = no || test $REPLACE_VDPRINTF = 1]
+errno [test $ac_cv_func_vdprintf = no || test $REPLACE_VDPRINTF = 1]
configure.ac:
gl_FUNC_VDPRINTF