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https://github.com/strukturag/libheif/pull/660
From a50ef159794ff66fc0a03d5269b1c36a000673ea Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Tue, 16 Aug 2022 02:23:13 +0100
Subject: [PATCH] configure.ac: fix bashism
configure scripts need to be runnable with a POSIX-compliant /bin/sh.
On many (but not all!) systems, /bin/sh is provided by Bash, so errors
like this aren't spotted. Notably Debian defaults to /bin/sh provided
by dash which doesn't tolerate such bashisms as '=='.
This retains compatibility with bash.
Fixes errors/warnings like:
```
checking for pthread_create in -lpthread... yes
checking for simple visibility declarations... yes
/var/tmp/portage/media-libs/libheif-1.12.0-r2/work/libheif-1.12.0/configure: 18821: test: x: unexpected operator
checking pkg-config is at least version 0.9.0... yes
checking for aom... yes
```
Signed-off-by: Sam James <sam@gentoo.org>
--- a/configure.ac
+++ b/configure.ac
@@ -85,7 +85,7 @@ AS_IF([test "x$enable_tests" = "xyes"], [
HAVE_VISIBILITY=0
CFLAG_VISIBILITY=
])
-AM_CONDITIONAL([HAVE_TESTS], [test "x$HAVE_TESTS" == "x1"])
+AM_CONDITIONAL([HAVE_TESTS], [test "x$HAVE_TESTS" = "x1"])
AM_CONDITIONAL([HAVE_VISIBILITY], [test "x$HAVE_VISIBILITY" != "x0"])
if eval "test x$enable_visibility = x" ; then enable_visibility=yes ; fi
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