Merge pull request mikebrady#144 from shtirlic/fix-configure

Use AC_SEARCH_LIBS for dns_sd in configure.ac.
Thanks for this – I'll take your word for it!

configure.ac

@@ -92,7 +92,7 @@ AC_ARG_WITH([configfiles],
 [ --with-configfiles = install configuration files during a make install ], ,[with_configfiles=yes])
 AM_CONDITIONAL([INSTALL_CONFIG_FILES], [test "x$with_configfiles" = "xyes"])
 
- 
+
 # Look for piddir flag
 AC_ARG_WITH(piddir, [ --with-piddir=<pathname> Specify a pathname to a directory in which to write the PID file.], [
  AC_MSG_CHECKING(--with-piddir argument)
@@ -187,7 +187,7 @@ AC_ARG_WITH(sndio, [ --with-sndio = choose native SNDIO API support (FreeBSD) -
  AC_DEFINE([CONFIG_SNDIO], 1, [Needed by the compiler.])
  AC_CHECK_LIB([sndio], [sio_open], , AC_MSG_ERROR(SNDIO support requires the sndio library!))], )
 AM_CONDITIONAL([USE_SNDIO], [test "x$HAS_SNDIO" = "x1"])
- 
+
 # Look for AO flag
 AC_ARG_WITH(ao, [ --with-ao = choose native AO (Audio Output?) API support -- probably broken], [
  AC_MSG_RESULT(>>Including an AO back end --- N.B. this is probably broken!)
@@ -210,7 +210,7 @@ AC_ARG_WITH(dns_sd, [ --with-dns_sd = choose dns_sd mDNS support], [
  AC_MSG_RESULT(>>Including dns_sd for mDNS support)
  HAS_DNS_SD=1
  AC_DEFINE([CONFIG_HAVE_DNS_SD_H], 1, [Needed by the compiler.])
- AC_CHECK_LIB([dns_sd], [DNSServiceRefDeallocate], , AC_MSG_ERROR(dns_sd support requires the dns_sd library!))], )
+ AC_SEARCH_LIBS([DNSServiceRefDeallocate], [dns_sd], , AC_MSG_ERROR(dns_sd support requires the dns_sd library!))], )
 AM_CONDITIONAL([USE_DNS_SD], [test "x$HAS_DNS_SD" = "x1"])
 
 # Checks for header files.