diff --git a/CMakeLists.txt b/CMakeLists.txt
index 435be93..6afd63e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,8 +2,8 @@ project (ndhcp)
 
 cmake_minimum_required (VERSION 2.6)
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -s -std=gnu99 -pedantic -Wall -lcap -D_GNU_SOURCE -DHAVE_CLEARENV -DLINUX")
-set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS} -s -std=gnu99 -pedantic -Wall -lcap -D_GNU_SOURCE -DHAVE_CLEARENV -DLINUX")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -s -std=gnu99 -pedantic -Wall -lrt -lcap -D_GNU_SOURCE -DHAVE_CLEARENV -DLINUX")
+set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS} -s -std=gnu99 -pedantic -Wall -lrt -lcap -D_GNU_SOURCE -DHAVE_CLEARENV -DLINUX")
 
 include_directories(
     "${PROJECT_SOURCE_DIR}/ncmlib"
diff --git a/Makefile b/Makefile
index 65aad04..da96f30 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@ makedir:
 	mkdir -p $(BUILD_DIR) $(OBJ_DIR)/ndhc $(OBJ_DIR)/ifchd $(OBJ_DIR)/ncmlib
 
 %.o: %.c
-	$(CC) $(CFLAGS) $(NCM_INC) -c -o $(OBJ_DIR)/$@ $<
+	$(CC) $(CFLAGS) $(IFCH_INC) $(NCM_INC) -c -o $(OBJ_DIR)/$@ $<
 
 ncmlib.a: $(NCM_OBJS)
 	$(AR) rc $(BUILD_DIR)/$@ $(subst ncmlib/,$(OBJ_DIR)/ncmlib/,$(NCM_OBJS))
@@ -37,7 +37,7 @@ ifchd: $(IFCHD_OBJS)
 	$(CC) $(CFLAGS) $(NCM_INC) -o $(BUILD_DIR)/$@ $(subst ifchd/,$(OBJ_DIR)/ifchd/,$(IFCHD_OBJS)) $(BUILD_DIR)/ncmlib.a -lcap 
 
 ndhc: $(NDHC_OBJS)
-	$(CC) $(CFLAGS) $(IFCH_INC) $(NCM_INC) -o $(BUILD_DIR)/$@ $(subst ndhc/,$(OBJ_DIR)/ndhc/,$(NDHC_OBJS)) $(BUILD_DIR)/ncmlib.a -lcap
+	$(CC) $(CFLAGS) $(IFCH_INC) $(NCM_INC) -o $(BUILD_DIR)/$@ $(subst ndhc/,$(OBJ_DIR)/ndhc/,$(NDHC_OBJS)) $(BUILD_DIR)/ncmlib.a -lcap -lrt
 
 .PHONY: all clean
 
diff --git a/ndhc/sys.h b/ndhc/sys.h
index 0c43701..e056153 100644
--- a/ndhc/sys.h
+++ b/ndhc/sys.h
@@ -28,15 +28,15 @@
 #ifndef SYS_H_
 #define SYS_H_
 
-#include <sys/time.h>
+#include <time.h>
 #include "ndhc-defines.h"
 #include "config.h"
 
 static inline unsigned long long curms()
 {
-    struct timeval tv;
-    gettimeofday(&tv, NULL);
-    return tv.tv_sec * 1000ULL + tv.tv_usec / 1000ULL;
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    return ts.tv_sec * 1000ULL + ts.tv_nsec / 1000000ULL;
 }
 
 extern char pidfile[MAX_PATH_LENGTH];