Fixed the scripts to avoid the warnings on non-windows systems arising from linking with an empty library. Patch from Steven Borley.

configure.in

@@ -373,11 +373,14 @@ dnl redefine the path for WINDOWS:
     AC_DEFINE_UNQUOTED(NGSPICEBINDIR, "`echo /spice_win/bin`" )
     AC_DEFINE_UNQUOTED(NGSPICEDATADIR, "`echo /spice_win/lib`" )
     WINMAIN="winmain.o"
+    WINDISPLIB="frontend/wdisp/libwindisp.a"
 else
     WINMAIN=""
+    WINDISPLIB=""
 fi
 
 AC_SUBST(WINMAIN)
+AC_SUBST(WINDISPLIB)
 
 
 # Recapitulate settings:

src/Makefile.am

@@ -81,7 +81,7 @@ ngspice_LDADD = \
 	@WINMAIN@ \
 	spice.o \
 	frontend/libfte.a \
-	frontend/wdisp/libwindisp.a \
+	@WINDISPLIB@ \
 	frontend/plotting/libplotting.a \
 	@XSPICELIB1@ \
 	spicelib/devices/dev.o \
@@ -120,7 +120,7 @@ ngnutmeg_SOURCES = \
 ngnutmeg_LDADD = \
 	@WINMAIN@ \
 	frontend/libfte.a \
-	frontend/wdisp/libwindisp.a \
+	@WINDISPLIB@ \
 	frontend/plotting/libplotting.a \
 	frontend/parser/libparser.a \
 	@NUMPARAMLIB@		\