harden ipc and frontend recovery

xim/Makefile

@@ -1,5 +1,7 @@
 CC = cc
-CFLAGS = -Wall -Wextra -O2 -I.. -Ixcb-imdkit/src
+XKB_CFLAGS := $(shell pkg-config --cflags xkbcommon)
+XKB_LIBS := $(shell pkg-config --libs xkbcommon)
+CFLAGS = -Wall -Wextra -O2 -I.. -Ixcb-imdkit/src $(XKB_CFLAGS)
 PROG = strans-xim
 
 SRCS = $(wildcard *.c)
@@ -9,8 +11,8 @@ LIBS = xcb-imdkit/libxcb-imdkit.a xcb-util/libxcb-util.a
 
 all: $(PROG)
 
-$(PROG): $(OBJS) $(LIBS)
-	$(CC) -o $@ $(OBJS) $(LIBS) -lxcb
+$(PROG): $(OBJS) $(LIBS) ../ipc.c ../ipc.h
+	$(CC) $(CFLAGS) -o $@ $(OBJS) ../ipc.c $(LIBS) -lxcb $(XKB_LIBS)
 
 $(OBJS): ../ipc.h