Fix out-of-tree build issue when using included zlib
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4027 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/rdr/Makefile.am b/common/rdr/Makefile.am
index 589ad80..d25f77c 100644
--- a/common/rdr/Makefile.am
+++ b/common/rdr/Makefile.am
@@ -14,5 +14,5 @@
if INCLUDED_ZLIB
librdr_la_CPPFLAGS += -I$(top_srcdir)/common/zlib
-librdr_la_LIBADD += $(top_srcdir)/common/zlib/libz.la
+librdr_la_LIBADD += $(top_builddir)/common/zlib/libz.la
endif