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diff -up ./build/gen_stub.php.syslib ./build/gen_stub.php
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--- ./build/gen_stub.php.syslib	2020-06-25 08:11:51.782046813 +0200
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+++ ./build/gen_stub.php	2020-06-25 08:13:11.188860368 +0200
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@@ -1075,6 +1075,12 @@ function initPhpParser() {
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     }
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     $isInitialized = true;
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+
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+    if (file_exists('/usr/share/php/PhpParser4/autoload.php')) {
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+        require_once '/usr/share/php/PhpParser4/autoload.php';
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+        return;
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+    }
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+
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     $version = "4.9.0";
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     $phpParserDir = __DIR__ . "/PHP-Parser-$version";
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     if (!is_dir($phpParserDir)) {