3.2. The configure.in file

dnl Process this file with autoconf to produce a configure script.

dnl AC_INIT is the first macro that should be called in an Autoconf
dnl script. It should be called with one argument that exhibits one
dnl of the source files
AC_INIT(rwlock.c)

dnl Initialize Automake
dnl The first paramater is the project name
dnl The second is the version
AM_INIT_AUTOMAKE(pthread_rwlock_fcfs, 0.4.0)

dnl Initialize libtool
AM_PROG_LIBTOOL

dnl Checks for programs.
AC_PROG_CC


dnl Checks for libraries.
AC_CHECK_LIB(pthread, pthread_create)

dnl Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS(sys/time.h unistd.h)

dnl Set the debug flag to no by default
debug_rwlock=no

dnl Set a command line option to set it otherwise
AC_ARG_ENABLE(debug-rwlock,
 [  --enable-debug-rwlock  Enable an RWLock that prints debug notices on the screen. This is a debugging feature which should not be usually enabled],
 [ debug_rwlock=yes
 ])

dnl If debug_rwlock is set
if test "x$debug_rwlock" = "xyes" ; then
    dnl Define the macro PTHREAD_RWLOCK_FCFS_DEBUG
    AC_DEFINE(PTHREAD_RWLOCK_FCFS_DEBUG)
fi

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_HEADER_TIME

dnl Checks for library functions.
AC_CHECK_FUNCS(gettimeofday)

dnl Output the files
AC_OUTPUT([Makefile man/Makefile])