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diff -Naur acpica-unix2-20191213.orig/source/compiler/dtcompiler.h acpica-unix2-20191213/source/compiler/dtcompiler.h
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--- acpica-unix2-20191213.orig/source/compiler/dtcompiler.h	2020-02-23 18:05:24.257395129 -0700
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+++ acpica-unix2-20191213/source/compiler/dtcompiler.h	2020-02-23 18:06:42.956236378 -0700
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@@ -351,7 +351,7 @@
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 /* dtparser - lex/yacc files */
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-UINT64                      DtCompilerParserResult; /* Expression return value */
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+extern UINT64                      DtCompilerParserResult; /* Expression return value */
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 int
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 DtCompilerParserparse (
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     void);
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diff -Naur acpica-unix2-20191213.orig/source/compiler/aslcompiler.l acpica-unix2-20191213/source/compiler/aslcompiler.l
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--- acpica-unix2-20191213.orig/source/compiler/aslcompiler.l	2019-12-13 08:58:18.000000000 -0700
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+++ acpica-unix2-20191213/source/compiler/aslcompiler.l	2020-02-24 15:08:53.067560139 -0700
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@@ -48,7 +48,7 @@
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 #include <stdlib.h>
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 #include <string.h>
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-YYSTYPE AslCompilerlval;
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+extern YYSTYPE AslCompilerlval;
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 /*
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  * Generation:  Use the following command line:
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diff -Naur acpica-unix2-20191213.orig/source/compiler/prparser.l acpica-unix2-20191213/source/compiler/prparser.l
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--- acpica-unix2-20191213.orig/source/compiler/prparser.l	2019-12-13 08:58:19.000000000 -0700
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+++ acpica-unix2-20191213/source/compiler/prparser.l	2020-02-24 15:09:25.909839732 -0700
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@@ -116,7 +116,7 @@
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 /*
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  * Local support functions
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  */
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-YY_BUFFER_STATE         LexBuffer;
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+extern YY_BUFFER_STATE         LexBuffer;
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 /******************************************************************************