diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..d42edd8
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,821 @@
+dnl configure.in for libevent
+dnl Copyright 2000-2007 Niels Provos
+dnl Copyright 2007-2012 Niels Provos and Nick Mathewson
+dnl
+dnl See LICENSE for copying information.
+dnl
+dnl Original version Dug Song <dugsong@monkey.org>
+
+AC_PREREQ(2.59)
+AC_INIT(event.c)
+
+AC_CONFIG_MACRO_DIR([m4])
+
+AM_INIT_AUTOMAKE(libevent,2.0.22-stable)
+AC_CONFIG_HEADERS(config.h)
+AC_DEFINE(NUMERIC_VERSION, 0x02001600, [Numeric representation of the version])
+
+dnl Initialize prefix.
+if test "$prefix" = "NONE"; then
+   prefix="/usr/local"
+fi
+
+AC_CANONICAL_BUILD
+AC_CANONICAL_HOST
+dnl the 'build' machine is where we run configure and compile
+dnl the 'host' machine is where the resulting stuff runs.
+
+case "$host_os" in
+
+ osf5*)
+    CFLAGS="$CFLAGS -D_OSF_SOURCE"
+    ;;
+esac
+
+dnl Checks for programs.
+AC_PROG_CC
+AM_PROG_CC_C_O
+AC_PROG_INSTALL
+AC_PROG_LN_S
+# AC_PROG_MKDIR_P - $(MKDIR_P) should be defined by AM_INIT_AUTOMAKE
+
+# AC_PROG_SED is only available in Autoconf >= 2.59b; workaround for older
+# versions
+ifdef([AC_PROG_SED], [AC_PROG_SED], [
+AC_CHECK_PROGS(SED, [gsed sed])
+])
+
+AC_PROG_GCC_TRADITIONAL
+
+# We need to test for at least gcc 2.95 here, because older versions don't
+# have -fno-strict-aliasing
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
+#if !defined(__GNUC__) || (__GNUC__ < 2) || (__GNUC__ == 2 && __GNUC_MINOR__ < 95)
+#error
+#endif])], have_gcc295=yes, have_gcc295=no)
+
+if test "$GCC" = "yes" ; then
+        # Enable many gcc warnings by default...
+        CFLAGS="$CFLAGS -Wall"
+	# And disable the strict-aliasing optimization, since it breaks
+	# our sockaddr-handling code in strange ways.
+	if test x$have_gcc295 = xyes; then
+		CFLAGS="$CFLAGS -fno-strict-aliasing"
+	fi
+fi
+
+# OS X Lion started deprecating the system openssl. Let's just disable
+# all deprecation warnings on OS X.
+case "$host_os" in
+
+ darwin*)
+    CFLAGS="$CFLAGS -Wno-deprecated-declarations"
+    ;;
+esac
+
+AC_ARG_ENABLE(gcc-warnings,
+     AS_HELP_STRING(--enable-gcc-warnings, enable verbose warnings with GCC))
+AC_ARG_ENABLE(thread-support,
+     AS_HELP_STRING(--disable-thread-support, disable support for threading),
+	[], [enable_thread_support=yes])
+AC_ARG_ENABLE(malloc-replacement,
+     AS_HELP_STRING(--disable-malloc-replacement, disable support for replacing the memory mgt functions),
+        [], [enable_malloc_replacement=yes])
+AC_ARG_ENABLE(openssl,
+     AS_HELP_STRING(--disable-openssl, disable support for openssl encryption),
+        [], [enable_openssl=yes])
+AC_ARG_ENABLE(debug-mode,
+     AS_HELP_STRING(--disable-debug-mode, disable support for running in debug mode),
+        [], [enable_debug_mode=yes])
+AC_ARG_ENABLE([libevent-install],
+     AS_HELP_STRING([--disable-libevent-install, disable installation of libevent]),
+	[], [enable_libevent_install=yes])
+AC_ARG_ENABLE([libevent-regress],
+     AS_HELP_STRING([--disable-libevent-regress, skip regress in make check]),
+	[], [enable_libevent_regress=yes])
+AC_ARG_ENABLE([function-sections],
+     AS_HELP_STRING([--enable-function-sections, make static library allow smaller binaries with --gc-sections]),
+	[], [enable_function_sections=no])
+
+
+AC_PROG_LIBTOOL
+
+dnl   Uncomment "AC_DISABLE_SHARED" to make shared librraries not get
+dnl   built by default.  You can also turn shared libs on and off from
+dnl   the command line with --enable-shared and --disable-shared.
+dnl AC_DISABLE_SHARED
+AC_SUBST(LIBTOOL_DEPS)
+
+AM_CONDITIONAL([BUILD_REGRESS], [test "$enable_libevent_regress" = "yes"])
+
+dnl Checks for libraries.
+AC_SEARCH_LIBS([inet_ntoa], [nsl])
+AC_SEARCH_LIBS([socket], [socket])
+AC_SEARCH_LIBS([inet_aton], [resolv])
+AC_SEARCH_LIBS([clock_gettime], [rt])
+AC_SEARCH_LIBS([sendfile], [sendfile])
+
+dnl - check if the macro WIN32 is defined on this compiler.
+dnl - (this is how we check for a windows version of GCC)
+AC_MSG_CHECKING(for WIN32)
+AC_TRY_COMPILE(,
+	[
+#ifndef WIN32
+die horribly
+#endif
+	],
+	bwin32=true; AC_MSG_RESULT(yes),
+	bwin32=false; AC_MSG_RESULT(no),
+)
+
+dnl - check if the macro __CYGWIN__ is defined on this compiler.
+dnl - (this is how we check for a cygwin version of GCC)
+AC_MSG_CHECKING(for CYGWIN)
+AC_TRY_COMPILE(,
+	[
+#ifndef __CYGWIN__
+die horribly
+#endif
+	],
+	cygwin=true; AC_MSG_RESULT(yes),
+	cygwin=false; AC_MSG_RESULT(no),
+)
+
+AC_CHECK_HEADERS([zlib.h])
+
+if test "x$ac_cv_header_zlib_h" = "xyes"; then
+dnl Determine if we have zlib for regression tests
+dnl Don't put this one in LIBS
+save_LIBS="$LIBS"
+LIBS=""
+ZLIB_LIBS=""
+have_zlib=no
+AC_SEARCH_LIBS([inflateEnd], [z],
+	[have_zlib=yes
+	ZLIB_LIBS="$LIBS"
+	AC_DEFINE(HAVE_LIBZ, 1, [Define if the system has zlib])])
+LIBS="$save_LIBS"
+AC_SUBST(ZLIB_LIBS)
+fi
+AM_CONDITIONAL(ZLIB_REGRESS, [test "$have_zlib" = "yes"])
+
+dnl See if we have openssl.  This doesn't go in LIBS either.
+if test "$bwin32" = true; then
+  EV_LIB_WS32=-lws2_32
+  EV_LIB_GDI=-lgdi32
+else
+  EV_LIB_WS32=
+  EV_LIB_GDI=
+fi
+AC_SUBST(EV_LIB_WS32)
+AC_SUBST(EV_LIB_GDI)
+AC_SUBST(OPENSSL_LIBADD)
+
+AC_CHECK_HEADERS([openssl/bio.h])
+
+if test "$enable_openssl" = "yes"; then
+save_LIBS="$LIBS"
+LIBS=""
+OPENSSL_LIBS=""
+have_openssl=no
+AC_SEARCH_LIBS([SSL_new], [ssl],
+	[have_openssl=yes
+	OPENSSL_LIBS="$LIBS -lcrypto $EV_LIB_GDI $EV_LIB_WS32 $OPENSSL_LIBADD"
+	AC_DEFINE(HAVE_OPENSSL, 1, [Define if the system has openssl])],
+	[have_openssl=no],
+	[-lcrypto $EV_LIB_GDI $EV_LIB_WS32 $OPENSSL_LIBADD])
+LIBS="$save_LIBS"
+AC_SUBST(OPENSSL_LIBS)
+fi
+
+dnl Checks for header files.
+AC_HEADER_STDC
+AC_CHECK_HEADERS([fcntl.h stdarg.h inttypes.h stdint.h stddef.h poll.h unistd.h sys/epoll.h sys/time.h sys/queue.h sys/event.h sys/param.h sys/ioctl.h sys/select.h sys/devpoll.h port.h netinet/in.h netinet/in6.h sys/socket.h sys/uio.h arpa/inet.h sys/eventfd.h sys/mman.h sys/sendfile.h sys/wait.h netdb.h])
+AC_CHECK_HEADERS([sys/stat.h])
+AC_CHECK_HEADERS(sys/sysctl.h, [], [], [
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+])
+if test "x$ac_cv_header_sys_queue_h" = "xyes"; then
+	AC_MSG_CHECKING(for TAILQ_FOREACH in sys/queue.h)
+	AC_EGREP_CPP(yes,
+[
+#include <sys/queue.h>
+#ifdef TAILQ_FOREACH
+ yes
+#endif
+],	[AC_MSG_RESULT(yes)
+	 AC_DEFINE(HAVE_TAILQFOREACH, 1,
+		[Define if TAILQ_FOREACH is defined in <sys/queue.h>])],
+	AC_MSG_RESULT(no)
+	)
+fi
+
+if test "x$ac_cv_header_sys_time_h" = "xyes"; then
+	AC_MSG_CHECKING(for timeradd in sys/time.h)
+	AC_EGREP_CPP(yes,
+[
+#include <sys/time.h>
+#ifdef timeradd
+ yes
+#endif
+],	[ AC_DEFINE(HAVE_TIMERADD, 1,
+		[Define if timeradd is defined in <sys/time.h>])
+	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
+)
+fi
+
+if test "x$ac_cv_header_sys_time_h" = "xyes"; then
+	AC_MSG_CHECKING(for timercmp in sys/time.h)
+	AC_EGREP_CPP(yes,
+[
+#include <sys/time.h>
+#ifdef timercmp
+ yes
+#endif
+],	[ AC_DEFINE(HAVE_TIMERCMP, 1,
+		[Define if timercmp is defined in <sys/time.h>])
+	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
+)
+fi
+
+if test "x$ac_cv_header_sys_time_h" = "xyes"; then
+	AC_MSG_CHECKING(for timerclear in sys/time.h)
+	AC_EGREP_CPP(yes,
+[
+#include <sys/time.h>
+#ifdef timerclear
+ yes
+#endif
+],	[ AC_DEFINE(HAVE_TIMERCLEAR, 1,
+		[Define if timerclear is defined in <sys/time.h>])
+	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
+)
+fi
+
+if test "x$ac_cv_header_sys_time_h" = "xyes"; then
+	AC_MSG_CHECKING(for timerisset in sys/time.h)
+	AC_EGREP_CPP(yes,
+[
+#include <sys/time.h>
+#ifdef timerisset
+ yes
+#endif
+],	[ AC_DEFINE(HAVE_TIMERISSET, 1,
+		[Define if timerisset is defined in <sys/time.h>])
+	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
+)
+fi
+
+if test "x$ac_cv_header_sys_sysctl_h" = "xyes"; then
+	AC_CHECK_DECLS([CTL_KERN, KERN_RANDOM, RANDOM_UUID, KERN_ARND], [], [],
+	   [[#include <sys/types.h>
+	     #include <sys/sysctl.h>]]
+	)
+fi
+
+AM_CONDITIONAL(BUILD_WIN32, test x$bwin32 = xtrue)
+AM_CONDITIONAL(BUILD_CYGWIN, test x$cygwin = xtrue)
+AM_CONDITIONAL(BUILD_WITH_NO_UNDEFINED, test x$bwin32 = xtrue || test x$cygwin = xtrue)
+
+if test x$bwin32 = xtrue; then
+   AC_SEARCH_LIBS([getservbyname],[ws2_32])
+fi
+
+dnl Checks for typedefs, structures, and compiler characteristics.
+AC_C_CONST
+AC_C_INLINE
+AC_HEADER_TIME
+
+dnl Checks for library functions.
+AC_CHECK_FUNCS([gettimeofday vasprintf fcntl clock_gettime strtok_r strsep])
+AC_CHECK_FUNCS([getnameinfo strlcpy inet_ntop inet_pton signal sigaction strtoll inet_aton pipe eventfd sendfile mmap splice arc4random arc4random_buf issetugid geteuid getegid getprotobynumber setenv unsetenv putenv sysctl])
+AC_CHECK_FUNCS([umask])
+
+AC_CACHE_CHECK(
+    [for getaddrinfo],
+    [libevent_cv_getaddrinfo],
+    [AC_LINK_IFELSE(
+	[AC_LANG_PROGRAM(
+	    [[
+		#ifdef HAVE_NETDB_H
+		#include <netdb.h>
+		#endif
+	    ]],
+	    [[
+		getaddrinfo;
+	    ]]
+	)],
+	[libevent_cv_getaddrinfo=yes],
+	[libevent_cv_getaddrinfo=no]
+    )]
+)
+if test "$libevent_cv_getaddrinfo" = "yes" ; then
+    AC_DEFINE([HAVE_GETADDRINFO], [1], [Do we have getaddrinfo()?])
+else
+
+AC_CHECK_FUNCS([getservbyname])
+# Check for gethostbyname_r in all its glorious incompatible versions.
+#   (This is cut-and-pasted from Tor, which based its logic on
+#   Python's configure.in.)
+AH_TEMPLATE(HAVE_GETHOSTBYNAME_R,
+  [Define this if you have any gethostbyname_r()])
+
+AC_CHECK_FUNC(gethostbyname_r, [
+  AC_MSG_CHECKING([how many arguments gethostbyname_r() wants])
+  OLD_CFLAGS=$CFLAGS
+  CFLAGS="$CFLAGS $MY_CPPFLAGS $MY_THREAD_CPPFLAGS $MY_CFLAGS"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#include <netdb.h>
+  ], [[
+    char *cp1, *cp2;
+    struct hostent *h1, *h2;
+    int i1, i2;
+    (void)gethostbyname_r(cp1,h1,cp2,i1,&h2,&i2);
+  ]])],[
+    AC_DEFINE(HAVE_GETHOSTBYNAME_R)
+    AC_DEFINE(HAVE_GETHOSTBYNAME_R_6_ARG, 1,
+     [Define this if gethostbyname_r takes 6 arguments])
+    AC_MSG_RESULT(6)
+  ], [
+    AC_TRY_COMPILE([
+#include <netdb.h>
+    ], [
+      char *cp1, *cp2;
+      struct hostent *h1;
+      int i1, i2;
+      (void)gethostbyname_r(cp1,h1,cp2,i1,&i2);
+    ], [
+      AC_DEFINE(HAVE_GETHOSTBYNAME_R)
+      AC_DEFINE(HAVE_GETHOSTBYNAME_R_5_ARG, 1,
+        [Define this if gethostbyname_r takes 5 arguments])
+      AC_MSG_RESULT(5)
+   ], [
+      AC_TRY_COMPILE([
+#include <netdb.h>
+     ], [
+       char *cp1;
+       struct hostent *h1;
+       struct hostent_data hd;
+       (void) gethostbyname_r(cp1,h1,&hd);
+     ], [
+       AC_DEFINE(HAVE_GETHOSTBYNAME_R)
+       AC_DEFINE(HAVE_GETHOSTBYNAME_R_3_ARG, 1,
+         [Define this if gethostbyname_r takes 3 arguments])
+       AC_MSG_RESULT(3)
+     ], [
+       AC_MSG_RESULT(0)
+     ])
+  ])
+ ])
+ CFLAGS=$OLD_CFLAGS
+])
+
+fi
+
+AC_CHECK_SIZEOF(long)
+
+AC_MSG_CHECKING(for F_SETFD in fcntl.h)
+AC_EGREP_CPP(yes,
+[
+#define _GNU_SOURCE
+#include <fcntl.h>
+#ifdef F_SETFD
+yes
+#endif
+],	[ AC_DEFINE(HAVE_SETFD, 1,
+	      [Define if F_SETFD is defined in <fcntl.h>])
+	  AC_MSG_RESULT(yes) ], AC_MSG_RESULT(no))
+
+needsignal=no
+haveselect=no
+if test x$bwin32 != xtrue; then
+    AC_CHECK_FUNCS(select, [haveselect=yes], )
+    if test "x$haveselect" = "xyes" ; then
+ 	needsignal=yes
+    fi
+fi
+AM_CONDITIONAL(SELECT_BACKEND, [test "x$haveselect" = "xyes"])
+
+havepoll=no
+AC_CHECK_FUNCS(poll, [havepoll=yes], )
+if test "x$havepoll" = "xyes" ; then
+	needsignal=yes
+fi
+AM_CONDITIONAL(POLL_BACKEND, [test "x$havepoll" = "xyes"])
+
+havedevpoll=no
+if test "x$ac_cv_header_sys_devpoll_h" = "xyes"; then
+	AC_DEFINE(HAVE_DEVPOLL, 1,
+		    [Define if /dev/poll is available])
+fi
+AM_CONDITIONAL(DEVPOLL_BACKEND, [test "x$ac_cv_header_sys_devpoll_h" = "xyes"])
+
+havekqueue=no
+if test "x$ac_cv_header_sys_event_h" = "xyes"; then
+	AC_CHECK_FUNCS(kqueue, [havekqueue=yes], )
+	if test "x$havekqueue" = "xyes" ; then
+		AC_MSG_CHECKING(for working kqueue)
+		AC_TRY_RUN(
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/event.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int
+main(int argc, char **argv)
+{
+	int kq;
+	int n;
+	int fd[[2]];
+	struct kevent ev;
+	struct timespec ts;
+	char buf[[8000]];
+
+	if (pipe(fd) == -1)
+		exit(1);
+	if (fcntl(fd[[1]], F_SETFL, O_NONBLOCK) == -1)
+		exit(1);
+
+	while ((n = write(fd[[1]], buf, sizeof(buf))) == sizeof(buf))
+		;
+
+        if ((kq = kqueue()) == -1)
+		exit(1);
+
+	memset(&ev, 0, sizeof(ev));
+	ev.ident = fd[[1]];
+	ev.filter = EVFILT_WRITE;
+	ev.flags = EV_ADD | EV_ENABLE;
+	n = kevent(kq, &ev, 1, NULL, 0, NULL);
+	if (n == -1)
+		exit(1);
+
+	read(fd[[0]], buf, sizeof(buf));
+
+	ts.tv_sec = 0;
+	ts.tv_nsec = 0;
+	n = kevent(kq, NULL, 0, &ev, 1, &ts);
+	if (n == -1 || n == 0)
+		exit(1);
+
+	exit(0);
+}, [AC_MSG_RESULT(yes)
+    AC_DEFINE(HAVE_WORKING_KQUEUE, 1,
+		[Define if kqueue works correctly with pipes])
+    havekqueue=yes
+    ], AC_MSG_RESULT(no), AC_MSG_RESULT(no))
+	fi
+fi
+AM_CONDITIONAL(KQUEUE_BACKEND, [test "x$havekqueue" = "xyes"])
+
+haveepollsyscall=no
+haveepoll=no
+AC_CHECK_FUNCS(epoll_ctl, [haveepoll=yes], )
+if test "x$haveepoll" = "xyes" ; then
+	AC_DEFINE(HAVE_EPOLL, 1,
+		[Define if your system supports the epoll system calls])
+	needsignal=yes
+fi
+if test "x$ac_cv_header_sys_epoll_h" = "xyes"; then
+	if test "x$haveepoll" = "xno" ; then
+		AC_MSG_CHECKING(for epoll system call)
+		AC_TRY_RUN(
+#include <stdint.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+
+int
+epoll_create(int size)
+{
+	return (syscall(__NR_epoll_create, size));
+}
+
+int
+main(int argc, char **argv)
+{
+	int epfd;
+
+	epfd = epoll_create(256);
+	exit (epfd == -1 ? 1 : 0);
+}, [AC_MSG_RESULT(yes)
+    AC_DEFINE(HAVE_EPOLL, 1,
+	[Define if your system supports the epoll system calls])
+    needsignal=yes
+    have_epoll=yes
+    AC_LIBOBJ(epoll_sub)
+    ], AC_MSG_RESULT(no), AC_MSG_RESULT(no))
+	fi
+fi
+AM_CONDITIONAL(EPOLL_BACKEND, [test "x$haveepoll" = "xyes"])
+
+haveeventports=no
+AC_CHECK_FUNCS(port_create, [haveeventports=yes], )
+if test "x$haveeventports" = "xyes" ; then
+	AC_DEFINE(HAVE_EVENT_PORTS, 1,
+		[Define if your system supports event ports])
+	needsignal=yes
+fi
+AM_CONDITIONAL(EVPORT_BACKEND, [test "x$haveeventports" = "xyes"])
+
+if test "x$bwin32" = "xtrue"; then
+	needsignal=yes
+fi
+
+AM_CONDITIONAL(SIGNAL_SUPPORT, [test "x$needsignal" = "xyes"])
+
+AC_TYPE_PID_T
+AC_TYPE_SIZE_T
+AC_TYPE_SSIZE_T
+
+AC_CHECK_TYPES([uint64_t, uint32_t, uint16_t, uint8_t, uintptr_t], , ,
+[#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+#include <inttypes.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif])
+
+AC_CHECK_TYPES([fd_mask], , ,
+[#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif])
+
+AC_CHECK_SIZEOF(long long)
+AC_CHECK_SIZEOF(long)
+AC_CHECK_SIZEOF(int)
+AC_CHECK_SIZEOF(short)
+AC_CHECK_SIZEOF(size_t)
+AC_CHECK_SIZEOF(void *)
+AC_CHECK_SIZEOF(off_t)
+
+AC_CHECK_TYPES([struct in6_addr, struct sockaddr_in6, sa_family_t, struct addrinfo, struct sockaddr_storage], , ,
+[#define _GNU_SOURCE
+#include <sys/types.h>
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_NETINET_IN6_H
+#include <netinet/in6.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef WIN32
+#define WIN32_WINNT 0x400
+#define _WIN32_WINNT 0x400
+#define WIN32_LEAN_AND_MEAN
+#if defined(_MSC_VER) && (_MSC_VER < 1300)
+#include <winsock.h>
+#else
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#endif
+#endif
+])
+AC_CHECK_MEMBERS([struct in6_addr.s6_addr32, struct in6_addr.s6_addr16, struct sockaddr_in.sin_len, struct sockaddr_in6.sin6_len, struct sockaddr_storage.ss_family, struct sockaddr_storage.__ss_family], , ,
+[#include <sys/types.h>
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_NETINET_IN6_H
+#include <netinet/in6.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef WIN32
+#define WIN32_WINNT 0x400
+#define _WIN32_WINNT 0x400
+#define WIN32_LEAN_AND_MEAN
+#if defined(_MSC_VER) && (_MSC_VER < 1300)
+#include <winsock.h>
+#else
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#endif
+#endif
+])
+
+AC_MSG_CHECKING([for socklen_t])
+AC_TRY_COMPILE([
+ #include <sys/types.h>
+ #include <sys/socket.h>],
+  [socklen_t x;],
+  AC_MSG_RESULT([yes]),
+  [AC_MSG_RESULT([no])
+  AC_DEFINE(socklen_t, unsigned int,
+	[Define to unsigned int if you dont have it])]
+)
+
+AC_MSG_CHECKING([whether our compiler supports __func__])
+AC_TRY_COMPILE([],
+ [ const char *cp = __func__; ],
+ AC_MSG_RESULT([yes]),
+ AC_MSG_RESULT([no])
+ AC_MSG_CHECKING([whether our compiler supports __FUNCTION__])
+ AC_TRY_COMPILE([],
+   [ const char *cp = __FUNCTION__; ],
+   AC_MSG_RESULT([yes])
+   AC_DEFINE(__func__, __FUNCTION__,
+         [Define to appropriate substitue if compiler doesnt have __func__]),
+   AC_MSG_RESULT([no])
+   AC_DEFINE(__func__, __FILE__,
+         [Define to appropriate substitue if compiler doesnt have __func__])))
+
+
+# check if we can compile with pthreads
+have_pthreads=no
+if test x$bwin32 != xtrue && test "$enable_thread_support" != "no"; then
+  ACX_PTHREAD([
+	AC_DEFINE(HAVE_PTHREADS, 1,
+		[Define if we have pthreads on this system])
+	have_pthreads=yes])
+  CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+  AC_CHECK_SIZEOF(pthread_t, ,
+     [AC_INCLUDES_DEFAULT()
+      #include <pthread.h> ]
+  )
+fi
+AM_CONDITIONAL(PTHREADS, [test "$have_pthreads" != "no" && test "$enable_thread_support" != "no"])
+
+# check if we should compile locking into the library
+if test x$enable_thread_support = xno; then
+   AC_DEFINE(DISABLE_THREAD_SUPPORT, 1,
+	[Define if libevent should not be compiled with thread support])
+fi
+
+# check if we should hard-code the mm functions.
+if test x$enable_malloc_replacement = xno; then
+  AC_DEFINE(DISABLE_MM_REPLACEMENT, 1,
+        [Define if libevent should not allow replacing the mm functions])
+fi
+
+# check if we should hard-code debugging out
+if test x$enable_debug_mode = xno; then
+  AC_DEFINE(DISABLE_DEBUG_MODE, 1,
+        [Define if libevent should build without support for a debug mode])
+fi
+
+# check if we have and should use openssl
+AM_CONDITIONAL(OPENSSL, [test "$enable_openssl" != "no" && test "$have_openssl" = "yes"])
+
+# Add some more warnings which we use in development but not in the
+# released versions.  (Some relevant gcc versions can't handle these.)
+if test x$enable_gcc_warnings = xyes && test "$GCC" = "yes"; then
+
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
+#if !defined(__GNUC__) || (__GNUC__ < 4)
+#error
+#endif])], have_gcc4=yes, have_gcc4=no)
+
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
+#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)
+#error
+#endif])], have_gcc42=yes, have_gcc42=no)
+
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
+#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 5)
+#error
+#endif])], have_gcc45=yes, have_gcc45=no)
+
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
+#if !defined(__clang__)
+#error
+#endif])], have_clang=yes, have_clang=no)
+
+  CFLAGS="$CFLAGS -W -Wfloat-equal -Wundef -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -Wredundant-decls -Wchar-subscripts -Wcomment -Wformat -Wwrite-strings -Wmissing-declarations -Wredundant-decls -Wnested-externs -Wbad-function-cast -Wswitch-enum -Werror"
+  CFLAGS="$CFLAGS -Wno-unused-parameter -Wstrict-aliasing"
+
+  if test x$have_gcc4 = xyes ; then
+    # These warnings break gcc 3.3.5 and work on gcc 4.0.2
+    CFLAGS="$CFLAGS -Winit-self -Wmissing-field-initializers -Wdeclaration-after-statement"
+    #CFLAGS="$CFLAGS -Wold-style-definition"
+  fi
+
+  if test x$have_gcc42 = xyes ; then
+    # These warnings break gcc 4.0.2 and work on gcc 4.2
+    CFLAGS="$CFLAGS -Waddress"
+  fi
+
+  if test x$have_gcc42 = xyes && test x$have_clang = xno; then
+    # These warnings break gcc 4.0.2 and clang, but work on gcc 4.2
+    CFLAGS="$CFLAGS -Wnormalized=id -Woverride-init"
+  fi
+
+  if test x$have_gcc45 = xyes ; then
+    # These warnings work on gcc 4.5
+    CFLAGS="$CFLAGS -Wlogical-op"
+  fi
+
+  if test x$have_clang = xyes; then
+    # Disable the unused-function warnings, because these trigger
+    # for minheap-internal.h related code.
+    CFLAGS="$CFLAGS -Wno-unused-function"
+
+    # clang on macosx emits warnigns for each directory specified which
+    # isn't "used" generating a lot of build noise (typically 3 warnings
+    # per file
+    case "$host_os" in
+        darwin*)
+            CFLAGS="$CFLAGS -Qunused-arguments"
+        ;;
+    esac
+  fi
+
+##This will break the world on some 64-bit architectures
+# CFLAGS="$CFLAGS -Winline"
+
+fi
+
+LIBEVENT_GC_SECTIONS=
+if test "$GCC" = yes && test "$enable_function_sections" = yes ; then
+    AC_CACHE_CHECK(
+	[if linker supports omitting unused code and data],
+	[libevent_cv_gc_sections_runs],
+	[
+	    dnl  NetBSD will link but likely not run with --gc-sections
+	    dnl  http://bugs.ntp.org/1844
+	    dnl  http://gnats.netbsd.org/40401
+	    dnl  --gc-sections causes attempt to load as linux elf, with
+	    dnl  wrong syscalls in place.  Test a little gauntlet of
+	    dnl  simple stdio read code checking for errors, expecting
+	    dnl  enough syscall differences that the NetBSD code will
+	    dnl  fail even with Linux emulation working as designed.
+	    dnl  A shorter test could be refined by someone with access
+	    dnl  to a NetBSD host with Linux emulation working.
+	    origCFLAGS="$CFLAGS"
+	    CFLAGS="$CFLAGS -Wl,--gc-sections"
+	    AC_LINK_IFELSE(
+		[AC_LANG_PROGRAM(
+		    [[
+			#include <stdlib.h>
+			#include <stdio.h>
+		    ]],
+		    [[
+			FILE *	fpC;
+			char	buf[32];
+			size_t	cch;
+			int	read_success_once;
+
+			fpC = fopen("conftest.c", "r");
+			if (NULL == fpC)
+				exit(1);
+			do {
+				cch = fread(buf, sizeof(buf), 1, fpC);
+				read_success_once |= (0 != cch);
+			} while (0 != cch);
+			if (!read_success_once)
+				exit(2);
+			if (!feof(fpC))
+				exit(3);
+			if (0 != fclose(fpC))
+				exit(4);
+
+			exit(EXIT_SUCCESS);
+		    ]]
+		)],
+		[
+                    dnl We have to do this invocation manually so that we can
+                    dnl get the output of conftest.err to make sure it doesn't
+                    dnl mention gc-sections.
+		    if test "X$cross_compiling" = "Xyes" || grep gc-sections conftest.err ; then
+			libevent_cv_gc_sections_runs=no
+		    else
+			libevent_cv_gc_sections_runs=no
+			./conftest >/dev/null 2>&1 && libevent_cv_gc_sections_runs=yes
+		    fi
+		],
+		[libevent_cv_gc_sections_runs=no]
+	    )
+	    CFLAGS="$origCFLAGS"
+	    AS_UNSET([origCFLAGS])
+	]
+    )
+    case "$libevent_cv_gc_sections_runs" in
+     yes)
+	CFLAGS="-ffunction-sections -fdata-sections $CFLAGS"
+	LIBEVENT_GC_SECTIONS="-Wl,--gc-sections"
+	;;
+    esac
+fi
+AC_SUBST([LIBEVENT_GC_SECTIONS])
+
+AM_CONDITIONAL([INSTALL_LIBEVENT], [test "$enable_libevent_install" = "yes"])
+
+AC_CONFIG_FILES( [libevent.pc libevent_openssl.pc libevent_pthreads.pc] )
+AC_OUTPUT(Makefile include/Makefile test/Makefile sample/Makefile)