------- configure.in --------
AC_INIT(xxx)
AM_INIT_AUTOMAKE([foreign])
AC_CONFIG_SRCDIR([src/xxx.c])
AC_CONFIG_HEADER([config.h])

AC_PROG_CC
AC_PROG_RANLIB
AC_PROG_INSTALL

AC_CONFIG_FILES([Makefile
                 src/Makefile])
AC_OUTPUT


------- Makefile.in --------
SUBDIRS = src


------- src/Makefile.in --------
INCLUDES = -I. -I.. -I../include

noinst_LIBRARIES = libxxx.a

libxxx_a_SOURCES = xxx.c