using double-linked list in order to get correct prev focus handling

config.mk

@@ -13,12 +13,12 @@ VERSION = 0.5
 LIBS = -L${PREFIX}/lib -L/usr/lib -lc -L${X11LIB} -lX11
 
 # Linux/BSD
-CFLAGS = -O3 -I. -I${PREFIX}/include -I/usr/include -I${X11INC} \
-	-DVERSION=\"${VERSION}\"
-LDFLAGS = ${LIBS}
-#CFLAGS = -g -Wall -O2 -I. -I${PREFIX}/include -I/usr/include -I${X11INC} \
+#CFLAGS = -O3 -I. -I${PREFIX}/include -I/usr/include -I${X11INC} \
 #	-DVERSION=\"${VERSION}\"
-#LDFLAGS = -g ${LIBS}
+#LDFLAGS = ${LIBS}
+CFLAGS = -g -Wall -O2 -I. -I${PREFIX}/include -I/usr/include -I${X11INC} \
+	-DVERSION=\"${VERSION}\"
+LDFLAGS = -g ${LIBS}
 
 
 # Solaris