diff --git a/xtrkcad/app/bin/CMakeLists.txt b/xtrkcad/app/bin/CMakeLists.txt
index dd51511..210fbb7 100644
--- a/xtrkcad/app/bin/CMakeLists.txt
+++ b/xtrkcad/app/bin/CMakeLists.txt
@@ -134,6 +134,7 @@ LINK_DIRECTORIES(${GTK_LIBRARY_DIRS})
 LINK_DIRECTORIES(${GTKHTML_LIBRARY_DIRS})
 
 ADD_LIBRARY(xtrkcad-lib ${SOURCES})
+TARGET_LINK_LIBRARIES(xtrkcad-lib X11 m)
 
 # This ensures that messages.h has been generated before we build xtrkcad-lib
 ADD_DEPENDENCIES(xtrkcad-lib Help)
@@ -142,7 +143,7 @@ ADD_EXECUTABLE(xtrkcad WIN32
 	misc.c 
 	xtrkcad.rc
 	)
-TARGET_LINK_LIBRARIES(xtrkcad xtrkcad-lib)
+TARGET_LINK_LIBRARIES(xtrkcad xtrkcad-lib X11 m)
 TARGET_LINK_LIBRARIES(xtrkcad xtrkcad-wlib)
 
 IF(WIN32 AND XTRKCAD_USE_GETTEXT)
diff --git a/xtrkcad/app/tools/halibut/CMakeLists.txt b/xtrkcad/app/tools/halibut/CMakeLists.txt
index ec7d74b..d6088d0 100644
--- a/xtrkcad/app/tools/halibut/CMakeLists.txt
+++ b/xtrkcad/app/tools/halibut/CMakeLists.txt
@@ -26,7 +26,7 @@ SET(SOURCES
 
 INCLUDE_DIRECTORIES(charset)
 ADD_EXECUTABLE(halibut ${SOURCES})
-TARGET_LINK_LIBRARIES(halibut xtrkcad-charset)
+TARGET_LINK_LIBRARIES(halibut xtrkcad-charset X11 m)
 
 ADD_SUBDIRECTORY(charset)
 
diff --git a/xtrkcad/app/wlib/gtklib/CMakeLists.txt b/xtrkcad/app/wlib/gtklib/CMakeLists.txt
index 5d1af51..d418ff4 100644
--- a/xtrkcad/app/wlib/gtklib/CMakeLists.txt
+++ b/xtrkcad/app/wlib/gtklib/CMakeLists.txt
@@ -31,5 +31,5 @@ INCLUDE_DIRECTORIES(${GTK_INCLUDE_DIRS})
 INCLUDE_DIRECTORIES(${GTKHTML_INCLUDE_DIRS})
 
 ADD_LIBRARY(xtrkcad-wlib ${HEADERS} ${SOURCES})
-TARGET_LINK_LIBRARIES(xtrkcad-wlib ${GTK_LIBRARIES})
+TARGET_LINK_LIBRARIES(xtrkcad-wlib ${GTK_LIBRARIES} X11 m)
 TARGET_LINK_LIBRARIES(xtrkcad-wlib ${GTKHTML_LIBRARIES})