diff --git a/bot2-frames/src/renderer/CMakeLists.txt b/bot2-frames/src/renderer/CMakeLists.txt
index 5366de9b..b7d20ae9 100644
--- a/bot2-frames/src/renderer/CMakeLists.txt
+++ b/bot2-frames/src/renderer/CMakeLists.txt
@@ -34,6 +34,7 @@ pods_install_pkg_config_file(bot2-frames-renderers
 #build the test-viewer
 add_executable(test-viewer test_viewer.c)
 target_link_libraries(test-viewer ${GLUT_LIBRARIES})
+target_link_libraries(test-viewer gthread-2.0)
 pods_use_pkg_config_packages(test-viewer 
                                          bot2-vis 
                                          bot2-lcmgl-renderer 
diff --git a/bot2-lcmgl/src/lcmgl-viewer/CMakeLists.txt b/bot2-lcmgl/src/lcmgl-viewer/CMakeLists.txt
index cdefdfbe..a03b8606 100644
--- a/bot2-lcmgl/src/lcmgl-viewer/CMakeLists.txt
+++ b/bot2-lcmgl/src/lcmgl-viewer/CMakeLists.txt
@@ -6,6 +6,8 @@ add_executable(bot-lcmgl-viewer
     view_menu.c
     )
 
+target_link_libraries(bot-lcmgl-viewer gthread-2.0)
+
 pods_use_pkg_config_packages(bot-lcmgl-viewer bot2-vis bot2-lcmgl-renderer)
 
 
diff --git a/bot2-vis/src/rwx-viewer/CMakeLists.txt b/bot2-vis/src/rwx-viewer/CMakeLists.txt
index 1242b1ae..b5f4e929 100644
--- a/bot2-vis/src/rwx-viewer/CMakeLists.txt
+++ b/bot2-vis/src/rwx-viewer/CMakeLists.txt
@@ -4,6 +4,8 @@ add_executable(bot-rwx-viewer
     main.c
     renderer_rwx.c)
 
+target_link_libraries(bot-rwx-viewer gthread-2.0)
+
 pods_use_pkg_config_packages(bot-rwx-viewer bot2-vis)
 
 pods_install_executables(bot-rwx-viewer)
diff --git a/bot2-vis/src/wavefront-viewer/CMakeLists.txt b/bot2-vis/src/wavefront-viewer/CMakeLists.txt
index 686c2e35..134c6a4c 100644
--- a/bot2-vis/src/wavefront-viewer/CMakeLists.txt
+++ b/bot2-vis/src/wavefront-viewer/CMakeLists.txt
@@ -4,6 +4,8 @@ add_executable(bot-wavefront-viewer
     main.c
     renderer_wavefront.c)
 
+target_link_libraries(bot-wavefront-viewer gthread-2.0)
+
 pods_use_pkg_config_packages(bot-wavefront-viewer bot2-vis)
 
 pods_install_executables(bot-wavefront-viewer)