* Russ Allbery: > Florian Weimer <fweimer@xxxxxxxxxx> writes: > >> I want to submit this upstream. Is there are some explanation somewhere >> why it's not permitted to invoke AC_CHECK_HEADER under shell conditional >> statement? I couldn't find it in the manual. > > It's documented under AS_IF: > > https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.71/html_node/Common-Shell-Constructs.html#index-AS_005fIF-1 > > The principle that one should always use an AS_* construct if one exists > rather than regular shell constructs could probably be documented more > aggressively. Thank you, this is helpful. Florian
