Fix tests linkage when building static libs.

diff --git a/simgear/sound/CMakeLists.txt b/simgear/sound/CMakeLists.txt
index 18141118570f82a49e526a20e7efc3db50f83331..6161b33b965a88fc58b8b622cf6f3b9db3f03f1d 100644 (file)
--- a/simgear/sound/CMakeLists.txt
+++ b/simgear/sound/CMakeLists.txt
@@ -29,7 +29,8 @@ else()
         sgsound sgio sgmath sgstructure sgthreads sgtiming sgmisc sgdebug
         ${CMAKE_THREAD_LIBS_INIT}
         ${RT_LIBRARY}
-        ${OPENAL_LIBRARY})
+        ${OPENAL_LIBRARY}
+        ${ZLIB_LIBRARY})
 endif()
 
 function(create_test TEST_NAME)