Use a variable, XFT_LIBS, instead #define LIB_X11_LIB.

src/Makefile.in

@@ -403,8 +403,8 @@ LIBXT=$(LIBW)
 #endif /* not USE_X_TOOLKIT */
 
 #if HAVE_XFT
-#undef LIB_X11_LIB
-#define LIB_X11_LIB @XFT_LIBS@
+#undef LIB_X11_LIB /* XFT_LIBS includes -lX11 */
+XFT_LIBS=@XFT_LIBS@"
 #endif /* HAVE_XFT */
 
 #if HAVE_XPM
@@ -451,7 +451,7 @@ LIBXT=$(LIBW)
 /* LD_SWITCH_X_DEFAULT comes after everything else that specifies
    options for where to find X libraries, but before those libraries.  */
 X11_LDFLAGS = LD_SWITCH_X_SITE LD_SWITCH_X_DEFAULT
-LIBX= $(LIBXMENU) $(X11_LDFLAGS) $(LIBXT) LIBTIFF LIBJPEG LIBPNG LIBGIF LIBXPM LIB_X11_LIB LIBX11_MACHINE LIBX11_SYSTEM
+LIBX= $(LIBXMENU) $(X11_LDFLAGS) $(LIBXT) LIBTIFF LIBJPEG LIBPNG LIBGIF LIBXPM LIB_X11_LIB LIBX11_MACHINE LIBX11_SYSTEM $(XFT_LIBS)
 #else /* not HAVE_X11 */
 LIBX= $(LIBXMENU) LD_SWITCH_X_SITE -lX10 LIBX10_MACHINE LIBX10_SYSTEM
 #endif /* not HAVE_X11 */