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diff -up Linux-PAM-1.0.4/configure.in.autoreconf Linux-PAM-1.0.4/configure.in
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--- Linux-PAM-1.0.4/configure.in.autoreconf	2009-03-16 16:57:54.000000000 +0100
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+++ Linux-PAM-1.0.4/configure.in	2009-03-16 16:57:54.000000000 +0100
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@@ -72,7 +72,7 @@ fi
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 AM_CONDITIONAL([STATIC_MODULES], [test "$STATIC_MODULES" != "no"])
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 dnl Checks for programs.
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-AC_GNU_SOURCE
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+AC_USE_SYSTEM_EXTENSIONS
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 AC_PROG_CC
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 AC_PROG_YACC
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 AM_PROG_LEX