x11/wdm build failure

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

	Hello,

	wdm link stage aborts with for example following error:
ld: src/TestLogin/TestLogin.o: in function `main':
TestLogin.c:(.text.startup+0x18a): undefined reference to `wusleep'
ld: TestLogin.c:(.text.startup+0x28c): undefined reference to `wusleep'
ld: TestLogin.c:(.text.startup+0x2ef): undefined reference to `wmalloc'
ld: TestLogin.c:(.text.startup+0x313): undefined reference to `wmalloc'
*** [bin/TestLogin] Error code 1

	Please add -lWINGs to librairy flag to avoid this error.
	
	Best regards,

	JB