+# check for bluetooth library
+bluetooth=0
+AC_CHECK_LIB(bluetooth, ba2str,[AC_CHECK_HEADER([bluetooth/bluetooth.h],bluetooth=1)])
+if test "$bluetooth" = 1
+then
+ AM_CONDITIONAL(HAVE_LIBBLUETOOTH, true)
+ AC_DEFINE([HAVE_LIBBLUETOOTH],[1],[Have bluetooth library])
+else
+ AM_CONDITIONAL(HAVE_LIBBLUETOOTH, false)
+fi
+if test "$build_target" = "mingw"
+then
+ bluetooth=1
+fi
+
+# check for libpulse(audio) library
+pulse=0
+AC_CHECK_LIB(pulse,pa_stream_peek,
+ [AC_CHECK_HEADER([pulse/simple.h],pulse=1)])
+if test "$pulse" = 1
+then
+ AC_DEFINE([HAVE_PULSE],[1],[Have libpulse(audio) library])
+fi
+if test "$build_target" = "mingw"
+then
+ pulse=0
+fi
+
+# check for libopus(audio) library
+opus=0
+AC_CHECK_LIB(opus,opus_decode_float,
+ [AC_CHECK_HEADER([opus/opus.h],
+ [AC_CHECK_DECL([OPUS_SET_GAIN],[opus=1],[],[[#include <opus/opus.h>]]
+ )]
+ )]
+)
+if test "$opus" = 1
+then
+ AC_DEFINE([HAVE_OPUS],[1],[Have libopus library])
+fi
+
+# libogg
+AC_CHECK_LIB(ogg, ogg_stream_flush_fill,
+ [AC_CHECK_HEADERS([ogg/ogg.h],
+ AM_CONDITIONAL(HAVE_OGG, true)
+ ogg=1
+ AC_DEFINE(HAVE_OGG,1,[Have ogg]),
+ AM_CONDITIONAL(HAVE_OGG, false)
+ ogg=0
+ AC_DEFINE(HAVE_OGG,0,[lacking ogg]))],
+ AM_CONDITIONAL(HAVE_OGG, false)
+ ogg=0)
+
+
+
+gst=0
+PKG_CHECK_MODULES(
+ [GST],
+ [glib-2.0 gobject-2.0 gstreamer-1.0 gstreamer-app-1.0 gstreamer-audio-1.0],
+ [
+ gst=1
+ AC_MSG_RESULT(ok)
+ ], [
+ gst=0
+ AC_MSG_RESULT(not found)
+ ])
+
+# Pulse Audio
+if test "x$pulse" != "x1" -o "x$opus" != "x1" -o "x$ogg" != "x1"
+then
+ if test "x$gst" != "x1"
+ then
+ conversation_backend=none
+ AM_CONDITIONAL(BUILD_PULSE_HELPERS, false)
+ AM_CONDITIONAL(BUILD_GST_HELPERS, false)
+ else
+ conversation_backend=gst
+ AM_CONDITIONAL(BUILD_PULSE_HELPERS, false)
+ AM_CONDITIONAL(BUILD_GST_HELPERS, true)
+ fi
+else
+ conversation_backend=pulse
+ AM_CONDITIONAL(BUILD_PULSE_HELPERS, true)
+ AM_CONDITIONAL(BUILD_GST_HELPERS, false)
+fi
+
+# libgnurl
+LIBGNURL_CHECK_CONFIG(,7.34.0,gnurl=1,gnurl=0)
+if test "$gnurl" = 1
+then
+ AM_CONDITIONAL(HAVE_LIBGNURL, true)
+ AC_DEFINE([HAVE_LIBGNURL],[1],[Have libgnurl])
+else
+ AM_CONDITIONAL(HAVE_LIBGNURL, false)
+fi
+
+# libcurl-gnutls
+LIBCURL_CHECK_CONFIG(,7.34.0,[curl=true],[curl=false])
+if test "x$curl" = xtrue
+then
+ AC_CHECK_HEADERS([curl/curl.h],
+ AC_CHECK_DECLS(CURLINFO_TLS_SESSION,[curl=true],[curl=false],[[#include <curl/curl.h>]]),
+ [curl=false])
+ # need libcurl-gnutls.so, everything else is not acceptable
+ AC_CHECK_LIB([curl-gnutls],[curl_easy_getinfo],,[curl=false])
+ # cURL must support CURLINFO_TLS_SESSION, version >= 7.34
+
+fi
+if test x$curl = xfalse
+then
+ AM_CONDITIONAL(HAVE_LIBCURL, false)
+if test "$gnurl" = 0
+then
+ AC_MSG_WARN([GNUnet requires libcurl-gnutls >= 7.34])
+fi
+else
+ AM_CONDITIONAL(HAVE_LIBCURL, true)
+ AC_DEFINE([HAVE_LIBCURL],[1],[Have CURL])
+fi
+
+
+# libidn
+AC_MSG_CHECKING([if Libidn can be used])
+AC_ARG_WITH(libidn, AC_HELP_STRING([--with-libidn=[DIR]],
+ [Support IDN (needs GNU Libidn)]),
+libidn=$withval, libidn=yes)
+if test "$libidn" != "no"; then
+ if test "$libidn" != "yes"; then
+ LDFLAGS="${LDFLAGS} -L$libidn/lib"
+ CPPFLAGS="${CPPFLAGS} -I$libidn/include"
+ fi
+fi
+libidn=no
+AC_CHECK_HEADER(idna.h,
+ AC_CHECK_LIB(idn, stringprep_check_version,
+ [libidn=yes LIBS="${LIBS} -lidn"], []), [])
+if test "$libidn" != "yes"; then
+ AC_MSG_FAILURE([GNUnet requires libidn.
+libidn-1.13 should be sufficient, newer versions work too.])
+fi
+AC_MSG_RESULT($libidn)
+