updated to newer autoconf standards

mpeg2dec/configure.in

 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ(2.52)
-AC_INIT(src/mpeg2dec.c)
+AC_INIT
+AC_CONFIG_SRCDIR([src/mpeg2dec.c])
 AC_CONFIG_AUX_DIR(autotools)
-AM_INIT_AUTOMAKE(mpeg2dec,0.2.1-cvs)
+AC_CONFIG_FILES([Makefile autotools/Makefile include/Makefile test/Makefile
+    doc/Makefile src/Makefile libmpeg2/Makefile libvo/Makefile vc++/Makefile])
+AM_INIT_AUTOMAKE([mpeg2dec],[0.2.1-cvs])
 AM_CONFIG_HEADER(include/config.h)
 AM_MAINTAINER_MODE
 AC_CANONICAL_HOST
@@ -51,8 +54,9 @@ if test x"$GCC" = x"yes"; then
 	OPT_CFLAGS="$CFLAGS -mabi=64"
 	AC_TRY_CFLAGS([$OPT_CFLAGS],[CFLAGS=$OPT_CFLAGS]);;
     esac
-elif test x"$CC" = x"tcc"; then
+elif test x"$CC" = x"tcc" -a x"`$CC -version 2>&1 | grep TenDRA`" != x""; then
     dnl TenDRA portability checking compiler
+    TENDRA=yes
     CFLAGS="-Xp -Yansi -f`pwd`/include/tendra.h"
     enable_mlib=no
     no_x=yes
@@ -78,9 +82,9 @@ dnl Checks for libraries.
 
 dnl Checks for header files.
 INCLUDES='-I$(top_srcdir)/include -I$(top_builddir)/include'
-AC_SUBST(INCLUDES)
+AC_SUBST([INCLUDES])
 AC_CHECK_HEADERS([string.h sys/time.h])
-AC_CHECK_GENERATE_INTTYPES(include)
+AC_CHECK_GENERATE_INTTYPES([include])
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
@@ -102,11 +106,11 @@ if test x"$enable_warnings" != x"no" -a x"$GCC" = x"yes"; then
     dnl compiler warnings
     OPT_CFLAGS="$CFLAGS -Wall -Werror"
     AC_TRY_CFLAGS([$OPT_CFLAGS],[CFLAGS=$OPT_CFLAGS])
-elif test x"$CC" = x"tcc"; then
+elif test x"$TENDRA" = x"yes"; then
     dnl TenDRA portability checking compiler
     CFLAGS="$CFLAGS -DTenDRA_check"
 fi
 
 AC_C_ATTRIBUTE_ALIGNED
 
-AC_OUTPUT(Makefile autotools/Makefile include/Makefile test/Makefile doc/Makefile src/Makefile libmpeg2/Makefile libvo/Makefile vc++/Makefile)
+AC_OUTPUT