configure.ac: Use Autoconf quadrigraphs for character set in AS_CASE The use of square brackets for a character set collides with the use of square brackets for m4 quote characters, so use the other quoting mechanism that Autoconf provides, by escaping `[` as `@<:@` and so on. Signed-off-by: Simon McVittie <smcv@collabora.com>
diff --git a/configure.ac b/configure.ac
index 4cab718..ed3405d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,7 +18,7 @@ SDL_VERSION=$SDL_MAJOR_VERSION.$SDL_MINOR_VERSION.$SDL_MICRO_VERSION
SDL_BINARY_AGE=`expr $SDL_MINOR_VERSION \* 100 + $SDL_MICRO_VERSION`
AS_CASE(["$SDL_MINOR_VERSION"],
- [*[02468]],
+ [*@<:@02468@:>@],
dnl Stable branch, 2.24.1 -> libSDL2-2.0.so.0.2400.1
[SDL_INTERFACE_AGE="$SDL_MICRO_VERSION"],
[*],