+# ------------------------------------------------------------------------------
+have_gnutls=no
+AC_ARG_ENABLE(gnutls, AS_HELP_STRING([--disable-gnutls], [disable gnutls support]))
+if test "x$enable_gnutls" != "xno"; then
+ PKG_CHECK_MODULES(GNUTLS, [gnutls >= 3.1.4],
+ [AC_DEFINE(HAVE_GNUTLS, 1, [Define if gnutls is available]) have_gnutls=yes], have_gnutls=no)
+ if test "x$have_gnutls" = xno -a "x$enable_gnutls" = xyes; then
+ AC_MSG_ERROR([*** gnutls support requested but libraries not found])
+ fi
+fi
+AM_CONDITIONAL(HAVE_GNUTLS, [test "$have_gnutls" = "yes"])
+
+# ------------------------------------------------------------------------------
+have_libcurl=no
+AC_ARG_ENABLE(libcurl, AS_HELP_STRING([--disable-libcurl], [disable libcurl support]))
+if test "x$enable_libcurl" != "xno"; then
+ PKG_CHECK_MODULES(LIBCURL, [libcurl],
+ [AC_DEFINE(HAVE_LIBCURL, 1, [Define if libcurl is available]) have_libcurl=yes], have_libcurl=no)
+ if test "x$have_libcurl" = xno -a "x$enable_libcurl" = xyes; then
+ AC_MSG_ERROR([*** libcurl support requested but libraries not found])
+ fi
+fi
+AM_CONDITIONAL(HAVE_LIBCURL, [test "$have_libcurl" = "yes"])
+
+# ------------------------------------------------------------------------------
+have_libidn=no
+AC_ARG_ENABLE(libidn, AS_HELP_STRING([--disable-libidn], [Disable optional LIBIDN support]))
+if test "x$enable_libidn" != "xno"; then
+ PKG_CHECK_MODULES(LIBIDN, [libidn],
+ [AC_DEFINE(HAVE_LIBIDN, 1, [Define if libidn is available])
+ have_libidn=yes
+ M4_DEFINES="$M4_DEFINES -DHAVE_LIBIDN"],
+ [have_libidn=no])
+ if test "x$have_libidn" = "xno" -a "x$enable_libidn" = "xyes"; then
+ AC_MSG_ERROR([*** libidn support requested but libraries not found])
+ fi
+fi
+AM_CONDITIONAL(HAVE_LIBIDN, [test "$have_libidn" = "yes"])
+
+# ------------------------------------------------------------------------------
+have_libiptc=no
+AC_ARG_ENABLE(libiptc, AS_HELP_STRING([--disable-libiptc], [Disable optional LIBIPTC support]))
+if test "x$enable_libiptc" != "xno"; then
+ PKG_CHECK_MODULES(LIBIPTC, [libiptc],
+ [AC_DEFINE(HAVE_LIBIPTC, 1, [Define if libiptc is available])
+ have_libiptc=yes
+ M4_DEFINES="$M4_DEFINES -DHAVE_LIBIPTC"],
+ [have_libiptc=no])
+ if test "x$have_libiptc" = "xno" -a "x$enable_libiptc" = "xyes"; then
+ AC_MSG_ERROR([*** libiptc support requested but libraries not found])
+ fi
+fi
+AM_CONDITIONAL(HAVE_LIBIPTC, [test "$have_libiptc" = "yes"])
+