An error occurred while compiling the autotools tool. Why?

Autotools tool compilation error, I do not know why-Linux general technology-Linux programming and kernel information, the following is a detailed reading. # Cd auto
# Ls
Add. c add. h main. c
* *********** The content of the file is as follows ************
/* Add. c */
Int add (int I, int j)
{
Int s;
S = I + j;
Return s;
}

/* Add. h */
Extern int add (int I, int j)
/* Main. c */
Void main ()
{
Int a = 1, B = 2;
Printf ("a + B = % d \ n", add (a, B ));
}
**************************************
# Autoscan
# Ls
Add. c add. h main. c autoscan. log configure. scan main. c
# Mv configure. scan configure. in
**********
# Cat configure. in
#-*-Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ (2.61)
AC_INIT (FULL-PACKAGE-NAME, VERSION, BUG-REPORT-ADDRESS)
AC_CONFIG_SRCDIR ([add. h])
AC_CONFIG_HEADER ([config. h])

# Checks for programs.
AC_PROG_CC

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.
AC_OUTPUT
* ******** The content of the above unmodified configure. in File
*****************
# Vi configure. in
#-*-Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ (2.61)
AC_INIT (main, 1.0, liujianqiao0426@163.com) # modified
AC_CONFIG_SRCDIR ([main. c]) # modified
AM_CONFIG_HEADER ([config. h]) # The AC is changed to AM.
AM_INIT_AUTOMAKE (main, 1.0) # added a row.
# Checks for programs.
AC_PROG_CC

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.
AC_OUTPUT9 ([Makefile)] # output file
* ***** The above is the modified configure. in File ********
**************************************** **
# Aclocal
* *** The following is the output information *****
/Usr/share/aclocal/ao. m4: 9: warning: underquoted definition of XIPH_PATH_AO
Run into '(automake) Extending aclocal'
Or see http://sources.redhat.com/automake/automake.html#Extending-aclocal
# Ls
Aclocal. m4 add. c add. h autom4te. cache autoscan. log configure. in main. c
# Autoconf
# Ls
Aclocal. m4 add. c add. h autom4te. cache autoscan. log configure. in main. c
# Autoheader
# Ls
Aclocal. m4 add. c add. h autom4te. cache autoscan. log configure. in config. h. in main. c
# Vi Makefile. am
AUTOMAKE_OPTIONS = foreign
Bin_PROGRAMS = main
Main_SOURCES = main. c add. c
# Automake -- add-missing