diff --git a/package/x11r7/xapp_xdm/Config.in b/package/x11r7/xapp_xdm/Config.in
index 1ac15ce368..adeb3ce0c0 100644
--- a/package/x11r7/xapp_xdm/Config.in
+++ b/package/x11r7/xapp_xdm/Config.in
@@ -3,6 +3,7 @@ config BR2_PACKAGE_XAPP_XDM
 	depends on BR2_USE_MMU # fork()
 	# Runtime dependency: can't start an X server unless there is one
 	depends on BR2_PACKAGE_XSERVER_XORG_SERVER
+	select BR2_PACKAGE_LIBXCRYPT if BR2_TOOLCHAIN_USES_GLIBC
 	select BR2_PACKAGE_XAPP_SESSREG
 	select BR2_PACKAGE_XAPP_XRDB
 	select BR2_PACKAGE_XLIB_LIBX11
diff --git a/package/x11r7/xapp_xdm/xapp_xdm.mk b/package/x11r7/xapp_xdm/xapp_xdm.mk
index 035f2e9484..2a343b55e2 100644
--- a/package/x11r7/xapp_xdm/xapp_xdm.mk
+++ b/package/x11r7/xapp_xdm/xapp_xdm.mk
@@ -30,6 +30,10 @@ else
 XAPP_XDM_CONF_OPTS += --without-xinerama
 endif
 
+ifeq ($(BR2_PACKAGE_LIBXCRYPT),y)
+XAPP_XDM_DEPENDENCIES += libxcrypt
+endif
+
 define XAPP_XDM_INSTALL_INIT_SYSV
 	$(INSTALL) -m 0755 -D package/x11r7/xapp_xdm/S99xdm \
 		$(TARGET_DIR)/etc/init.d/S99xdm