Backed out accidental removal of disable-dnssd flag

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1152757 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

dnssd/configure.in.in

@@ -1,17 +1,38 @@
 #MIN_CONFIG
 
-# Check for pkg-config manually first, as if its not installed the
-# PKG_PROG_PKG_CONFIG macro won't be defined.
-m4_pattern_allow(PKG_CONFIG_MIN_VERSION)
-AC_CHECK_PROG(have_pkg_config, pkg-config, yes, no)
-
-if test x"$have_pkg_config" == xno; then
-    AC_MSG_ERROR(pkg-config is required to install this program)
+AC_ARG_ENABLE(dnssd, [  --disable-dnssd     don't require libdns_sd (browsing and publishing DNS-SD services will not be possible) ],  with_dnssd=$enableval, with_dnssd=yes)
+if test "$with_dnssd" = "yes"; then
+AC_MSG_CHECKING(for DNS-SD support)
+save_dnssdtest_LIBS="$LIBS"
+save_dnssdtest_LDFLAGS="$LDFLAGS"
+save_dnssdtest_CPPFLAGS="$CPPFLAGS"
+LDFLAGS="$all_libraries $LDFLAGS"
+CPPFLAGS="$CPPFLAGS $all_includes"
+case $host_os in
+  darwin*) LIBS="" ;;
+  *) LIBS="-ldns_sd" ;;
+esac
+have_libdns_sd="no"
+AC_TRY_LINK(	[
+			#include <dns_sd.h>
+		],[
+			DNSServiceRefDeallocate( (DNSServiceRef) 0);
+			TXTRecordDeallocate( (TXTRecordRef*) 0);
+		],[
+			AC_DEFINE(HAVE_DNSSD,1,[Define if dns-sd is available])
+			case $host_os in
+				darwin*) LIB_DNSSD="" ;;
+				*) LIB_DNSSD="-ldns_sd" ;;
+			esac
+			have_libdns_sd="yes"
+			AC_MSG_RESULT(yes)
+		],[
+			AC_MSG_RESULT(no)
+                        LIB_DNSSD=""
+])
+CPPFLAGS=$save_dnssdtest_CPPFLAGS
+LDFLAGS=$save_dnssdtest_LDFLAGS
+LIBS=$save_dnssdtest_LIBS
 fi
-
-PKG_PROG_PKG_CONFIG
-
-PKG_CHECK_MODULES( AVAHI, [ avahi-qt3 >= 0.4 , avahi-client >= 0.4 ])
-AC_SUBST(AVAHI_CFLAGS)
-AC_SUBST(AVAHI_LIBS)
-PKG_CHECK_EXISTS( [ avahi-client >= 0.6], AC_DEFINE(AVAHI_API_0_6,1,[Avahi API 0.6] ) )
+AC_SUBST(LIB_DNSSD)
+AM_CONDITIONAL(HAVE_DNSSD, test "$have_libdns_sd" = "yes")