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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>
This commit is contained in:
Simon McVittie 2022-05-05 16:06:11 +01:00 committed by Sam Lantinga
parent c244bbc515
commit b03e08f376
1 changed files with 1 additions and 1 deletions
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configure.ac
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@ -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"],
[*],