configure.ac

	AC_MSG_RESULT(yes)
	AC_DEFINE([HAVE_VARIABLE_FDSET], 1, [Define to 1 if your system can support larger than default select bitmasks.]),
	AC_MSG_RESULT(no),
	AC_MSG_RESULT(cross-compile)
)

if test "${ac_cv_have_variable_fdset}x" = "0x"; then
	AC_RUN_IFELSE(
		[AC_LANG_PROGRAM([
#include <unistd.h>
#include <sys/types.h>
#include <stdlib.h>
], [if (getuid() != 0) { exit(1); }])],
		AC_DEFINE([CONFIGURE_RAN_AS_ROOT], 1, [Some configure tests will unexpectedly fail if configure is run by a non-root user.  These may be able to be tested at runtime.]))
fi

AST_GCC_ATTRIBUTE(pure)
AST_GCC_ATTRIBUTE(malloc)
AST_GCC_ATTRIBUTE(const)
AST_GCC_ATTRIBUTE(unused)
AST_GCC_ATTRIBUTE(always_inline)
AST_GCC_ATTRIBUTE(deprecated)
AST_GCC_ATTRIBUTE(sentinel)
AST_GCC_ATTRIBUTE(warn_unused_result)
AST_GCC_ATTRIBUTE(may_alias)
AST_GCC_ATTRIBUTE(constructor)
AST_GCC_ATTRIBUTE(destructor)

AC_MSG_CHECKING(for -ffunction-sections support)
saved_CFLAGS="${CFLAGS}"
CFLAGS="${CFLAGS} -ffunction-sections"
AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM([], [int x = 1;])],
	AC_MSG_RESULT(yes)
	[saved_LDFLAGS="${LDFLAGS}"]
	[LDFLAGS="${LDFLAGS} -Wl,--gc-sections"]
	AC_MSG_CHECKING(for --gc-sections support)
	AC_LINK_IFELSE(
		[AC_LANG_PROGRAM([], [int x = 1;])],
		AC_MSG_RESULT(yes)
		[GC_CFLAGS="-ffunction-sections"]
		[[GC_LDFLAGS="-Wl,--gc-sections"]],
		AC_MSG_RESULT(no)
	)
	[LDFLAGS="${saved_LDFLAGS}"],
	AC_MSG_RESULT(no)
)
CFLAGS="${saved_CFLAGS}"
AC_SUBST(GC_CFLAGS)
AC_SUBST(GC_LDFLAGS)

AC_MSG_CHECKING(for -Wdeclaration-after-statement support)
if $(${CC} -Wdeclaration-after-statement -S -o /dev/null -xc /dev/null > /dev/null 2>&1); then
	AC_MSG_RESULT(yes)
	AST_DECLARATION_AFTER_STATEMENT=-Wdeclaration-after-statement
else
	AC_MSG_RESULT(no)
	AST_DECLARATION_AFTER_STATEMENT=
fi
AC_SUBST(AST_DECLARATION_AFTER_STATEMENT)

AC_MSG_CHECKING(for -Wtrampolines support)
if $(${CC} -Wtrampolines -S -o /dev/null -xc /dev/null > /dev/null 2>&1); then
	AC_MSG_RESULT(yes)
	AST_TRAMPOLINES=-Wtrampolines
else
	AC_MSG_RESULT(no)
	AST_TRAMPOLINES=
fi
AC_SUBST(AST_TRAMPOLINES)

AC_MSG_CHECKING(for _FORTIFY_SOURCE support)
if $(${CC} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -S -o /dev/null -xc /dev/null > /dev/null 2>&1); then
	AC_MSG_RESULT(yes)
	AST_FORTIFY_SOURCE="-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
else
	AC_MSG_RESULT(no)
	AST_FORTIFY_SOURCE=
fi
AC_SUBST(AST_FORTIFY_SOURCE)

AC_MSG_CHECKING(for -fno-strict-overflow)
if $(${CC} -O2 -fno-strict-overflow -S -o /dev/null -xc /dev/null > /dev/null 2>&1); then
	AC_MSG_RESULT(yes)
	AST_NO_STRICT_OVERFLOW=-fno-strict-overflow
else
	AC_MSG_RESULT(no)
	AST_NO_STRICT_OVERFLOW=
fi
AC_SUBST(AST_NO_STRICT_OVERFLOW)

AC_MSG_CHECKING(for -Wshadow)
if $(${CC} -Wshadow -S -o /dev/null -xc /dev/null > /dev/null 2>&1); then
	AC_MSG_RESULT(yes)
	AST_SHADOW_WARNINGS=-Wshadow
else
	AC_MSG_RESULT(no)
	AST_SHADOW_WARNINGS=
fi
AC_SUBST(AST_SHADOW_WARNINGS)

AC_MSG_CHECKING(for -march=native support)
if $(${CC} -march=native -S -o /dev/null -xc /dev/null > /dev/null 2>&1); then
	if test "${CONFIG_CFLAGS}" = ""; then
		AC_MSG_RESULT(yes)
		AST_NATIVE_ARCH=1
	else
		AC_MSG_RESULT(user CFLAGS present)
		AST_NATIVE_ARCH=
	fi
else
	AC_MSG_RESULT(no)
	AST_NATIVE_ARCH=
fi
AC_SUBST(AST_NATIVE_ARCH)

dnl Nested functions required for RAII implementation
AC_MSG_CHECKING(for -fnested-functions)
AC_COMPILE_IFELSE(
	dnl Prototype needed due to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36774
	[AC_LANG_PROGRAM([], [auto void foo(void); void foo(void) {}])],
	AC_MSG_RESULT(no)
	[AST_NESTED_FUNCTIONS=],
	AC_MSG_RESULT(required)
	[AST_NESTED_FUNCTIONS=-fnested-functions]
)
AC_SUBST(AST_NESTED_FUNCTIONS)

dnl Check to see if rpath should be set in LDFLAGS
AC_ARG_ENABLE(rpath,
	[AC_HELP_STRING([--disable-rpath],
			[Disables rpath linker option checking])],
	[case "${enableval}" in
		y|ye|yes) check_rpath=yes ;;
		n|no) check_rpath=no ;;
                *) AC_MSG_ERROR(bad value ${enableval} for --disable-rpath) ;;
	esac], [check_rpath=yes])

AC_MSG_CHECKING(whether to use rpath)
AST_RPATH=
if test "${check_rpath}" != yes; then
	AC_MSG_RESULT(skipped)
elif test "${prefix}" = /usr || test "${prefix}" = NONE; then
	AC_MSG_RESULT(not needed)
else
	AST_RPATH="-Wl,-rpath,${libdir}"
fi
AC_SUBST(AST_RPATH)

AC_MSG_CHECKING(for sysinfo)
AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([#include <sys/sysinfo.h>],
                        [struct sysinfo sys_info; int uptime = sys_info.uptime])],
        AC_MSG_RESULT(yes)
        AC_DEFINE([HAVE_SYSINFO], 1, [Define to 1 if your system has sysinfo support]),
        AC_MSG_RESULT(no)
)

AC_SEARCH_LIBS(res_9_ninit, resolv)
AC_MSG_CHECKING(for res_ninit)
AC_LINK_IFELSE(
	[AC_LANG_PROGRAM([
			#ifdef HAVE_SYS_SOCKET_H
			#include <sys/socket.h>
			#endif
			#ifdef HAVE_NETINET_IN_H
			#include <netinet/in.h>
			#endif
			#ifdef HAVE_ARPA_NAMESER_H
			#include <arpa/nameser.h>
			#endif
			#include <resolv.h>],
			[int foo = res_ninit(NULL);])],
	AC_MSG_RESULT(yes)
	AC_DEFINE([HAVE_RES_NINIT], 1, [Define to 1 if your system has the re-entrant resolver functions.])
	AC_SEARCH_LIBS(res_9_ndestroy, resolv)
	AC_MSG_CHECKING(for res_ndestroy)
	AC_LINK_IFELSE(
		[AC_LANG_PROGRAM([
				#ifdef HAVE_SYS_SOCKET_H
				#include <sys/socket.h>
				#endif
				#ifdef HAVE_NETINET_IN_H
				#include <netinet/in.h>
				#endif
				#ifdef HAVE_ARPA_NAMESER_H
				#include <arpa/nameser.h>
				#endif
				#include <resolv.h>],
				[res_ndestroy(NULL);])],
		AC_MSG_RESULT(yes)
		AC_DEFINE([HAVE_RES_NDESTROY], 1, [Define to 1 if your system has the ndestroy resolver function.]),
		AC_MSG_RESULT(no)
	)
	AC_SEARCH_LIBS(res_9_close, resolv)
	AC_MSG_CHECKING(for res_close)
	AC_LINK_IFELSE(
		[AC_LANG_PROGRAM([
				#ifdef HAVE_SYS_SOCKET_H
				#include <sys/socket.h>
				#endif
				#ifdef HAVE_NETINET_IN_H
				#include <netinet/in.h>
				#endif
				#ifdef HAVE_ARPA_NAMESER_H
				#include <arpa/nameser.h>
				#endif
				#include <resolv.h>],
				[res_close();])],
		AC_MSG_RESULT(yes)
		AC_DEFINE([HAVE_RES_CLOSE], 1, [Define to 1 if your system has the close resolver function.]),
		AC_MSG_RESULT(no)
	),
	AC_MSG_RESULT(no)
)

AST_C_DEFINE_CHECK([GLOB_NOMAGIC], [GLOB_NOMAGIC], [glob.h])

AST_C_DEFINE_CHECK([GLOB_BRACE], [GLOB_BRACE], [glob.h])

AST_C_DEFINE_CHECK([RTLD_NOLOAD], [RTLD_NOLOAD], [dlfcn.h])

AST_C_DEFINE_CHECK([IP_MTU_DISCOVER], [IP_MTU_DISCOVER], [netinet/in.h])

AC_CHECK_HEADER([libkern/OSAtomic.h],
                [AC_DEFINE_UNQUOTED([HAVE_OSX_ATOMICS], 1, [Define to 1 if OSX atomic operations are supported.])])

AC_CHECK_SIZEOF([int])
AC_CHECK_SIZEOF([long])
AC_CHECK_SIZEOF([long long])
AC_CHECK_SIZEOF([char *])
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)
AC_COMPUTE_INT([ac_cv_sizeof_fd_set_fds_bits], [sizeof(foo.fds_bits[[0]])], [$ac_includes_default
fd_set foo;])
# This doesn't actually work; what it does is to use the variable set in the
# previous test as a cached value to set the right output variables.
AC_CHECK_SIZEOF(fd_set.fds_bits)

# Set a type compatible with the previous.  We cannot just use a generic type
# for these bits, because on big-endian systems, the bits won't match up
# correctly if the size is wrong.
if test $ac_cv_sizeof_int = $ac_cv_sizeof_fd_set_fds_bits; then
  AC_DEFINE([TYPEOF_FD_SET_FDS_BITS], [int], [Define to a type of the same size as fd_set.fds_bits[[0]]])
else if test $ac_cv_sizeof_long = $ac_cv_sizeof_fd_set_fds_bits; then
  AC_DEFINE([TYPEOF_FD_SET_FDS_BITS], [long], [Define to a type of the same size as fd_set.fds_bits[[0]]])
else if test $ac_cv_sizeof_long_long = $ac_cv_sizeof_fd_set_fds_bits; then
  AC_DEFINE([TYPEOF_FD_SET_FDS_BITS], [long long], [Define to a type of the same size as fd_set.fds_bits[[0]]])
fi ; fi ; fi

AC_MSG_CHECKING(for dladdr in dlfcn.h)
PBX_DLADDR=0
old_LIBS=${LIBS}
LIBS="${LIBS} -ldl"
AC_LINK_IFELSE(
	[AC_LANG_PROGRAM([#define _GNU_SOURCE 1
#include <dlfcn.h>],
		[dladdr((void *)0, (void *)0)]
	)],
	AC_MSG_RESULT(yes)
	PBX_DLADDR=1
	AC_SUBST([PBX_DLADDR])
	AC_DEFINE([HAVE_DLADDR], 1, [Define to 1 if your system has the dladdr() GNU extension]),
	AC_MSG_RESULT(no)
)
LIBS=${old_LIBS}

# PKGCONFIG is used in later tests
PKG_PROG_PKG_CONFIG()


# do the package library checks now

AST_EXT_LIB_CHECK([ALSA], [asound], [snd_spcm_init], [alsa/asoundlib.h], [-lm -ldl])

AST_EXT_LIB_CHECK([BFD], [bfd], [bfd_openr], [bfd.h])

if test "${PBX_BFD}" = "0"; then
  # Fedora/RedHat/CentOS require extra libraries
  AST_EXT_LIB_CHECK([BFD], [bfd], [bfd_check_format], [bfd.h], [-ldl -liberty])
fi

if test "${PBX_BFD}" = "0"; then
  # openSUSE requires -lz
  AST_EXT_LIB_CHECK([BFD], [bfd], [bfd_check_format], [bfd.h], [-ldl -liberty -lz])
fi

if test "x${OSARCH}" = "xlinux-gnu" ; then
  AST_EXT_LIB_CHECK([CAP], [cap], [cap_from_text], [sys/capability.h])
fi

AST_C_DEFINE_CHECK([DAHDI], [DAHDI_RESET_COUNTERS], [dahdi/user.h], [230])
AST_C_DEFINE_CHECK([DAHDI], [DAHDI_DEFAULT_MTU_MRU], [dahdi/user.h], [220])
AST_C_DEFINE_CHECK([DAHDI], [DAHDI_CODE], [dahdi/user.h], [200])

AST_C_DEFINE_CHECK([DAHDI_HALF_FULL], [DAHDI_POLICY_HALF_FULL], [dahdi/user.h])

AST_C_COMPILE_CHECK([DAHDI_LINEREVERSE_VMWI], [struct dahdi_vmwi_info booger], [dahdi/user.h], , [enhanced dahdi vmwi support])

AST_C_COMPILE_CHECK([DAHDI_ECHOCANCEL_FAX_MODE], [int foo = DAHDI_ECHOCANCEL_FAX_MODE], [dahdi/user.h])

AST_C_COMPILE_CHECK([GETIFADDRS], [struct ifaddrs *p; getifaddrs(&p)], [ifaddrs.h], , [getifaddrs() support])
AST_C_COMPILE_CHECK([TIMERFD], [timerfd_create(0,0); timerfd_settime(0,0,NULL,NULL);], [sys/timerfd.h], , [timerfd support])

GSM_INTERNAL="yes"
AC_SUBST(GSM_INTERNAL)
GSM_SYSTEM="yes"
if test "${USE_GSM}" != "no"; then
   if test "${GSM_DIR}" = "internal"; then
      GSM_SYSTEM="no"
   elif test "${GSM_DIR}" != ""; then
      GSM_INTERNAL="no"
   fi
   if test "${GSM_SYSTEM}" = "yes"; then
      gsmlibdir=""
      if test "x${GSM_DIR}" != "x"; then
         if test -d ${GSM_DIR}/lib; then
            gsmlibdir="-L${GSM_DIR}/lib"
         else
            gsmlibdir="-L${GSM_DIR}"
         fi
      fi
      AC_CHECK_LIB([gsm], [gsm_create], AC_DEFINE_UNQUOTED([HAVE_GSM], 1,
      [Define to indicate the GSM library]), [], ${gsmlibdir})
      if test "${ac_cv_lib_gsm_gsm_create}" = "yes"; then
         if test "x${GSM_DIR}" != "x" ; then
            AC_CHECK_HEADER([${GSM_DIR}/include/gsm.h], [GSM_HEADER_FOUND=1], [GSM_HEADER_FOUND=0])
            AC_CHECK_HEADER([${GSM_DIR}/include/gsm/gsm.h], [GSM_GSM_HEADER_FOUND=1], [GSM_GSM_HEADER_FOUND=0])
         else
            AC_CHECK_HEADER([gsm.h], [GSM_HEADER_FOUND=1], [GSM_HEADER_FOUND=0])
            AC_CHECK_HEADER([gsm/gsm.h], [GSM_GSM_HEADER_FOUND=1], [GSM_GSM_HEADER_FOUND=0])
         fi
         if test "${GSM_HEADER_FOUND}" = "0" ; then
            if test "{GSM_GSM_HEADER_FOUND}" = "0" ; then
               if test "x${GSM_MANDATORY}" = "xyes" ; then
                  AC_MSG_NOTICE([***])
                  AC_MSG_NOTICE([*** It appears that you do not have the gsm development package installed.])
                  AC_MSG_NOTICE([*** Please install it to include ${GSM_DESCRIP} support, or re-run configure])
                  AC_MSG_NOTICE([*** without explicitly specifying --with-${GSM_OPTION}])
                  exit 1
               fi
            fi
         fi
         GSM_OK=0
         if test "${GSM_HEADER_FOUND}" = "1" ; then
            AC_DEFINE_UNQUOTED([HAVE_GSM_HEADER], 1, [Define to indicate that gsm.h has no prefix for its location])
            GSM_OK=1
         else
            if test "${GSM_GSM_HEADER_FOUND}" = "1" ; then
               AC_DEFINE_UNQUOTED([HAVE_GSM_GSM_HEADER], 1, [Define to indicate that gsm.h is in gsm/gsm.h])
               GSM_OK=1
            fi
         fi
         if test "${GSM_OK}" = "1" ; then
            GSM_LIB="-lgsm"
            if test "x${GSM_DIR}" != "x"; then
               GSM_LIB="${gsmlibdir} ${GSM_LIB}"
               GSM_INCLUDE="-I${GSM_DIR}/include"
            fi
            PBX_GSM=1
            GSM_INTERNAL="no"
         fi
      fi
   fi
   if test "${GSM_INTERNAL}" = "yes"; then
      PBX_GSM=1
      AC_DEFINE_UNQUOTED([HAVE_GSM_HEADER], 1, [Define to indicate that gsm.h has no prefix for its location])
   fi
fi

ILBC_INTERNAL="yes"
AC_SUBST(ILBC_INTERNAL)
ILBC_SYSTEM="yes"
if test "${USE_ILBC}" != "no"; then
   if test "${ILBC_DIR}" = "internal"; then
      ILBC_SYSTEM="no"
   elif test "${ILBC_DIR}" != ""; then
      ILBC_INTERNAL="no"
   fi
   if test "${ILBC_SYSTEM}" = "yes"; then
      AST_PKG_CONFIG_CHECK(ILBC, libilbc)
      if test "$PBX_ILBC" = "1"; then
	 ILBC_INTERNAL="no"
      fi
   fi
   if test "${ILBC_INTERNAL}" = "yes"; then
      PBX_ILBC=1
   fi
fi

LIBEDIT_INTERNAL="yes"
AC_SUBST(LIBEDIT_INTERNAL)
LIBEDIT_SYSTEM="yes"
if test "${USE_LIBEDIT}" != "no"; then
   if test "${LIBEDIT_DIR}" = "internal"; then
      LIBEDIT_SYSTEM="no"
   elif test "${LIBEDIT_DIR}" != ""; then
      LIBEDIT_INTERNAL="no"
   fi
   if test "${LIBEDIT_SYSTEM}" = "yes"; then
      AST_PKG_CONFIG_CHECK(LIBEDIT, libedit)
      if test "$PBX_LIBEDIT" = "1"; then
	 LIBEDIT_INTERNAL="no"
      fi
   fi
   if test "${LIBEDIT_INTERNAL}" = "yes"; then
      PBX_LIBEDIT=1
   fi
fi

AST_EXT_LIB_CHECK([ICONV], [iconv], [iconv_open], [iconv.h])
# GNU libiconv #define's iconv_open to libiconv_open, so we need to search for that symbol
AST_EXT_LIB_CHECK([ICONV], [iconv], [libiconv_open], [iconv.h])
# Some versions of Linux package iconv in glibc
AST_EXT_LIB_CHECK([ICONV], [c], [iconv_close], [iconv.h])

# If ical.h is NOT in the libical directory, then it is of a version insufficient for us.
AST_EXT_LIB_CHECK([ICAL], [ical], [icaltimezone_get_utc_timezone], [libical/ical.h], [${PTHREAD_LIBS}], [${PTHREAD_CFLAGS}])

AST_EXT_LIB_CHECK([IKSEMEL], [iksemel], [iks_start_sasl], [iksemel.h])

if test "${USE_IMAP_TK}" != "no"; then
	saved_cppflags="${CPPFLAGS}"
	saved_libs="${LIBS}"
	switch_to_system_on_failure="no"
	if test "${IMAP_TK_DIR}" = ""; then
		IMAP_TK_DIR=`pwd`"/../imap-2004g"
		switch_to_system_on_failure="yes"
	fi
	if test "${IMAP_TK_DIR}" != "system"; then
		AC_MSG_CHECKING(for UW IMAP Toolkit c-client library)
		if test -f "${IMAP_TK_DIR}/c-client/LDFLAGS"; then
      		imap_ldflags=`cat ${IMAP_TK_DIR}/c-client/LDFLAGS`
		fi
		imap_libs="${IMAP_TK_DIR}/c-client/c-client.a"
	  	imap_include="-I${IMAP_TK_DIR}/c-client"
      	CPPFLAGS="${CPPFLAGS} ${imap_include}"
	  	LIBS="${LIBS} ${imap_libs} "`echo ${imap_ldflags}`
	  	AC_LINK_IFELSE(
	    	[AC_LANG_PROGRAM(
				[#include "c-client.h"
				void mm_searched (MAILSTREAM *stream,unsigned long number)
				{
				}
				void mm_exists (MAILSTREAM *stream,unsigned long number)
				{
				}
				void mm_expunged (MAILSTREAM *stream,unsigned long number)
				{
				}
				void mm_flags (MAILSTREAM *stream,unsigned long number)
				{
				}
				void mm_notify (MAILSTREAM *stream,char *string,long errflg)
				{
				}
				void mm_list (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
				{
				}
				void mm_lsub (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
				{
				}
				void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
				{
				}
				void mm_log (char *string,long errflg)
				{
				}
				void mm_dlog (char *string)
				{
				}
				void mm_login (NETMBX *mb,char *user,char *pwd,long trial)
				{
				}
				void mm_critical (MAILSTREAM *stream)
				{
				}
				void mm_nocritical (MAILSTREAM *stream)
				{
				}
				long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
				{
				}
				void mm_fatal (char *string)
				{
				}],
				[
				MAILSTREAM *foo = mail_open(NULL, "", 0);
				]
			)],
			[ac_cv_imap_tk="yes"],
			[ac_cv_imap_tk="no"]
	   	)
		if test "${ac_cv_imap_tk}" = "yes"; then
			AC_LINK_IFELSE(
				[AC_LANG_PROGRAM(
					[#include "c-client.h"
					void mm_searched (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_exists (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_expunged (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_flags (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_notify (MAILSTREAM *stream,char *string,long errflg)
					{
					}
					void mm_list (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
					{
					}
					void mm_lsub (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
					{
					}
					void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
					{
					}
					void mm_log (char *string,long errflg)
					{
					}
					void mm_dlog (char *string)
					{
					}
					void mm_login (NETMBX *mb,char *user,char *pwd,long trial)
					{
					}
					void mm_critical (MAILSTREAM *stream)
					{
					}
					void mm_nocritical (MAILSTREAM *stream)
					{
					}
					long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
					{
					}
					void mm_fatal (char *string)
					{
					}],
					[
					long check = mail_expunge_full(NULL, "", 0);
					]
				)],
				[ac_cv_imap_tk2006="yes"],
				[ac_cv_imap_tk2006="no"]
			)
		fi
		CPPFLAGS="${saved_cppflags}"
		LIBS="${saved_libs}"
		if test "${ac_cv_imap_tk}" = "no"; then
			AC_MSG_RESULT(no)
			if test "${switch_to_system_on_failure}" = "yes"; then
				IMAP_TK_DIR="system"
			else #This means they specified a directory. Search for a package installation there too
				AC_MSG_CHECKING([for system c-client library...])
				CPPFLAGS="${saved_cppflags}"
				LIBS="${saved_libs}"
				imap_include="-I${IMAP_TK_DIR}/include"
				imap_ldflags="-L${IMAP_TK_DIR}/lib"
				imap_libs="-lc-client"
				CPPFLAGS="${CPPFLAGS} ${imap_include}"
				LIBS="${LIBS} ${imap_libs} ${imap_ldflags}"
				AC_LINK_IFELSE(
	    			[AC_LANG_PROGRAM(
						[#include "c-client.h"
						void mm_searched (MAILSTREAM *stream,unsigned long number)
						{
						}
						void mm_exists (MAILSTREAM *stream,unsigned long number)
						{
						}
						void mm_expunged (MAILSTREAM *stream,unsigned long number)
						{
						}
						void mm_flags (MAILSTREAM *stream,unsigned long number)
						{
						}
						void mm_notify (MAILSTREAM *stream,char *string,long errflg)
						{
						}
						void mm_list (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
						{
						}
						void mm_lsub (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
						{
						}
						void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
						{
						}
						void mm_log (char *string,long errflg)
						{
						}
						void mm_dlog (char *string)
						{
						}
						void mm_login (NETMBX *mb,char *user,char *pwd,long trial)
						{
						}
						void mm_critical (MAILSTREAM *stream)
						{
						}
						void mm_nocritical (MAILSTREAM *stream)
						{
						}
						long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
						{
						}
						void mm_fatal (char *string)
						{
						}],
						[
						MAILSTREAM *foo = mail_open(NULL, "", 0);
						]
					)],
					[ac_cv_imap_tk="yes"],
					[ac_cv_imap_tk="no"]
	   			)
				if test "${ac_cv_imap_tk}" = "yes"; then
					AC_LINK_IFELSE(
						[AC_LANG_PROGRAM(
							[#include "c-client.h"
							void mm_searched (MAILSTREAM *stream,unsigned long number)
							{
							}
							void mm_exists (MAILSTREAM *stream,unsigned long number)
							{
							}
							void mm_expunged (MAILSTREAM *stream,unsigned long number)
							{
							}
							void mm_flags (MAILSTREAM *stream,unsigned long number)
							{
							}
							void mm_notify (MAILSTREAM *stream,char *string,long errflg)
							{
							}
							void mm_list (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
							{
							}
							void mm_lsub (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
							{
							}
							void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
							{
							}
							void mm_log (char *string,long errflg)
							{
							}
							void mm_dlog (char *string)
							{
							}
							void mm_login (NETMBX *mb,char *user,char *pwd,long trial)
							{
							}
							void mm_critical (MAILSTREAM *stream)
							{
							}
							void mm_nocritical (MAILSTREAM *stream)
							{
							}
							long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
							{
							}
							void mm_fatal (char *string)
							{
							}],
							[
							long check = mail_expunge_full(NULL, "", 0);
							]
						)],
						[ac_cv_imap_tk2006="yes"],
						[ac_cv_imap_tk2006="no"]
					)
				fi
			fi
		fi
	fi
	if test "${IMAP_TK_DIR}" = "system"; then
		#We will enter here if user specified "system" or if any of above checks failed
		AC_MSG_CHECKING([for system c-client library...])
		CPPFLAGS="${saved_cppflags}"
		LIBS="${saved_libs}"
		imap_ldflags=""
		imap_libs="-lc-client"
		imap_include="-DUSE_SYSTEM_IMAP" #Try the imap directory first
		CPPFLAGS="${CPPFLAGS} ${imap_include}"
		LIBS="${LIBS} ${imap_libs} "`echo ${imap_ldflags}`
		AC_LINK_IFELSE(
	    	[AC_LANG_PROGRAM(
				[#include <stdio.h>
				#include <imap/c-client.h>
				void mm_searched (MAILSTREAM *stream,unsigned long number)
				{
				}
				void mm_exists (MAILSTREAM *stream,unsigned long number)
				{
				}
				void mm_expunged (MAILSTREAM *stream,unsigned long number)
				{
				}
				void mm_flags (MAILSTREAM *stream,unsigned long number)
				{
				}
				void mm_notify (MAILSTREAM *stream,char *string,long errflg)
				{
				}
				void mm_list (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
				{
				}
				void mm_lsub (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
				{
				}
				void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
				{
				}
				void mm_log (char *string,long errflg)
				{
				}
				void mm_dlog (char *string)
				{
				}
				void mm_login (NETMBX *mb,char *user,char *pwd,long trial)
				{
				}
				void mm_critical (MAILSTREAM *stream)
				{
				}
				void mm_nocritical (MAILSTREAM *stream)
				{
				}
				long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
				{
				}
				void mm_fatal (char *string)
				{
				}],
				[
				MAILSTREAM *foo = mail_open(NULL, "", 0);
				]
			)],
			[ac_cv_imap_tk="yes"],
			[ac_cv_imap_tk="no"]
	   	)
		if test "${ac_cv_imap_tk}" = "yes"; then
			AC_LINK_IFELSE(
				[AC_LANG_PROGRAM(
					[#include <stdio.h>
					#include <imap/c-client.h>
					void mm_searched (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_exists (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_expunged (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_flags (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_notify (MAILSTREAM *stream,char *string,long errflg)
					{
					}
					void mm_list (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
					{
					}
					void mm_lsub (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
					{
					}
					void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
					{
					}
					void mm_log (char *string,long errflg)
					{
					}
					void mm_dlog (char *string)
					{
					}
					void mm_login (NETMBX *mb,char *user,char *pwd,long trial)
					{
					}
					void mm_critical (MAILSTREAM *stream)
					{
					}
					void mm_nocritical (MAILSTREAM *stream)
					{
					}
					long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
					{
					}
					void mm_fatal (char *string)
					{
					}],
					[
					long check = mail_expunge_full(NULL, "", 0);
					]
				)],
				[ac_cv_imap_tk2006="yes"],
				[ac_cv_imap_tk2006="no"]
			)
		else #looking in imap directory didn't work, try c-client
			imap_ldflags=""
			imap_libs="-lc-client"
			imap_include="-DUSE_SYSTEM_CCLIENT"
			CPPFLAGS="${saved_cppflags}"
			LIBS="${saved_libs}"
			CPPFLAGS="${CPPFLAGS} ${imap_include}"
			LIBS="${LIBS} ${imap_libs} "`echo ${imap_ldflags}`
			AC_LINK_IFELSE(
	    		[AC_LANG_PROGRAM(
					[#include <stdio.h>
					#include <c-client/c-client.h>
					void mm_searched (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_exists (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_expunged (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_flags (MAILSTREAM *stream,unsigned long number)
					{
					}
					void mm_notify (MAILSTREAM *stream,char *string,long errflg)
					{
					}
					void mm_list (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
					{
					}
					void mm_lsub (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
					{
					}
					void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
					{
					}
					void mm_log (char *string,long errflg)
					{
					}
					void mm_dlog (char *string)
					{
					}
					void mm_login (NETMBX *mb,char *user,char *pwd,long trial)
					{
					}
					void mm_critical (MAILSTREAM *stream)
					{
					}
					void mm_nocritical (MAILSTREAM *stream)
					{
					}
					long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
					{
					}
					void mm_fatal (char *string)
					{
					}],
					[
					MAILSTREAM *foo = mail_open(NULL, "", 0);
					]
				)],
				[ac_cv_imap_tk="yes"],
				[ac_cv_imap_tk="no"]
	   		)
			if test "${ac_cv_imap_tk}" = "yes"; then
				AC_LINK_IFELSE(
					[AC_LANG_PROGRAM(
						[#include <stdio.h>
						#include <c-client/c-client.h>
						void mm_searched (MAILSTREAM *stream,unsigned long number)
						{
						}
						void mm_exists (MAILSTREAM *stream,unsigned long number)
						{
						}
						void mm_expunged (MAILSTREAM *stream,unsigned long number)
						{
						}
						void mm_flags (MAILSTREAM *stream,unsigned long number)
						{
						}
						void mm_notify (MAILSTREAM *stream,char *string,long errflg)
						{
						}
						void mm_list (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
						{
						}
						void mm_lsub (MAILSTREAM *stream,int delimiter,char *mailbox,long attributes)
						{
						}
						void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
						{
						}
						void mm_log (char *string,long errflg)
						{
						}
						void mm_dlog (char *string)
						{
						}
						void mm_login (NETMBX *mb,char *user,char *pwd,long trial)
						{
						}
						void mm_critical (MAILSTREAM *stream)
						{
						}
						void mm_nocritical (MAILSTREAM *stream)
						{
						}
						long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
						{
						}
						void mm_fatal (char *string)
						{
						}],
						[
						long check = mail_expunge_full(NULL, "", 0);
						]
					)],
					[ac_cv_imap_tk2006="yes"],
					[ac_cv_imap_tk2006="no"]
				)
			fi
		fi
	fi
	if test "${ac_cv_imap_tk}" = "yes"; then
		AC_MSG_RESULT(yes)
		IMAP_TK_LIB="${imap_libs} "`echo ${imap_ldflags}`
		IMAP_TK_INCLUDE="${imap_include}"
		PBX_IMAP_TK=1
		AC_DEFINE([HAVE_IMAP_TK], 1, [Define if your system has the UW IMAP Toolkit c-client library.])
		if test "${ac_cv_imap_tk2006}" = "yes"; then
			AC_DEFINE([HAVE_IMAP_TK2006], 1, [Define if your system has the UW IMAP Toolkit c-client library version 2006 or greater.])
		fi
	else
		AC_MSG_RESULT(no)
	fi
	CPPFLAGS="${saved_cppflags}"
	LIBS="${saved_libs}"
fi

AST_EXT_LIB_CHECK([IODBC], [iodbc], [SQLConnect], [sql.h], [${PTHREAD_LIBS}], [${PTHREAD_CFLAGS}])

AST_EXT_LIB_CHECK([INOTIFY], [c], [inotify_init], [sys/inotify.h])

AST_EXT_LIB_CHECK([JACK], [jack], [jack_activate], [jack/jack.h])

# BSD (and OS X) equivalent of inotify
AST_EXT_LIB_CHECK([KQUEUE], [c], [kqueue], [sys/event.h])

# 64-bit version of kevent (from kqueue) on OS X
AC_CHECK_FUNCS([kevent64])

# Needed by unixodbc
AST_EXT_LIB_CHECK([LTDL], [ltdl], [lt_dlinit], [ltdl.h], [])

AST_EXT_LIB_CHECK([LDAP], [ldap], [ldap_initialize], [ldap.h])

AST_EXT_LIB_CHECK([MISDN], [mISDN], [mISDN_open], [mISDNuser/mISDNlib.h])

if test "${PBX_MISDN}" = 1; then
   AST_EXT_LIB_CHECK([ISDNNET], [isdnnet], [init_manager], [mISDNuser/isdn_net.h], [-lmISDN -lpthread])
   AST_EXT_LIB_CHECK([SUPPSERV], [suppserv], [encodeFac], [mISDNuser/suppserv.h])
   AST_C_DEFINE_CHECK([MISDN_FAC_RESULT], [Fac_RESULT], [mISDNuser/suppserv.h])
   AST_C_DEFINE_CHECK([MISDN_FAC_ERROR], [Fac_ERROR], [mISDNuser/suppserv.h])
   AC_CHECK_HEADER([linux/mISDNdsp.h], [AC_DEFINE_UNQUOTED([MISDN_1_2], 1, [Build chan_misdn for mISDN 1.2 or later.])])
   AC_CHECK_MEMBER([Q931_info_t.redirect_dn], [], [PBX_MISDN=0], [#include <mISDNuser/mISDNlib.h>])
fi

AST_EXT_TOOL_CHECK([MYSQLCLIENT], [mysql_config])

AST_EXT_LIB_CHECK([NBS], [nbs], [nbs_connect], [nbs.h])

AST_EXT_TOOL_CHECK([NEON], [neon-config])

AST_EXT_TOOL_CHECK([NEON29], [neon-config], , [--libs],
[#include <ne_auth.h>],
[#ifndef NE_AUTH_NTLM
#error Need libneon >= 0.29.0
#endif])

AST_EXT_TOOL_CHECK([NETSNMP], [net-snmp-config], , [--agent-libs],
[#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>],
[int callback = snmp_register_callback(0, 0, NULL, NULL)])

AST_EXT_LIB_CHECK([NEWT], [newt], [newtBell], [newt.h])

AST_EXT_LIB_CHECK([UNIXODBC], [odbc], [SQLConnect], [sql.h], [])

AST_EXT_LIB_CHECK([OGG], [ogg], [ogg_sync_init], [])

# Non-glibc platforms require libexecinfo for backtrace support
AST_EXT_LIB_CHECK([BKTR], [execinfo], [backtrace], [execinfo.h])
# Linux, however, has backtrace directly in glibc
AST_EXT_LIB_CHECK([BKTR], [c], [backtrace], [execinfo.h])