diff --git a/configure.ac b/configure.ac
index ebb289c2648376eda77507de0bfc1e33eb1f33e6..a968ae8561a00102100e8f0e9a017300e9e512db 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,6 +10,7 @@ AC_CONFIG_HEADERS([config.h])
 AC_PROG_CC
 AC_PROG_RANLIB
 AM_INIT_AUTOMAKE([subdir-objects])
+CC="$CC -std=gnu11"
 
 # Checks for libraries.
 AC_CHECK_LIB(ncurses, initscr, [], [echo "missing ncurses support!";exit -1])
@@ -26,6 +27,18 @@ AC_TYPE_PID_T
 AC_FUNC_MALLOC
 AC_CHECK_FUNCS([memset realpath strstr strtoul])
 
+# AC_ARGS_ENABLES
+AC_ARG_ENABLE([debug],
+  [AS_HELP_STRING([--enable-debug], [debug program(default is disable)])],
+  [CFLAGS="-g -O0"],
+  [CFLAGS="-g -O2"]
+)
+
+AC_ARG_ENABLE([secure-build],
+  [AS_HELP_STRING([--enable-secure-build], [build project with secure flags])],
+  [CFLAGS="${CFLAGS} -Wl,-z,relro,-z,now -fPIE -fPIC -pie -Werror -Wall -ftrapv -fstack-protector-all -D_FORTIFY_SOURCE=2 -O2"],[]
+)
+
 AC_CONFIG_FILES([Makefile
                  src/Makefile])
 AC_OUTPUT
diff --git a/src/domain.c b/src/domain.c
index 274ede5bce25a7a0da211c469ecf998abcfa7fc8..6b4ac2b2d14e062b05613f692fbf2f6ad03e80b8 100644
--- a/src/domain.c
+++ b/src/domain.c
@@ -123,7 +123,7 @@ static int get_id_from_cgroup(pid_t pid)
     char *tmp = NULL;
     int id = -1;
 
-    if (snprintf(path, CGROUP_PATH_SIZE, "/proc/%lu/cgroup", pid) < 0) {
+    if (snprintf(path, CGROUP_PATH_SIZE, "/proc/%u/cgroup", pid) < 0) {
         return id;
     }
     fp = fopen(path, "r");
@@ -156,7 +156,7 @@ static int get_child_pid(struct domain *dom)
     char *end = NULL;
     int i = 0;
 
-    if (snprintf(path, TASK_STRING_SIZE, "/proc/%lu/task", dom->pid) < 0) {
+    if (snprintf(path, TASK_STRING_SIZE, "/proc/%u/task", dom->pid) < 0) {
         return -1;
     }
     dirptr = opendir(path);
diff --git a/src/proc.c b/src/proc.c
index 9cb2d8e2776934c50e51162023cf2246fc5cf72f..2200bf0658ae26ad4110ee8de8f2efdef8c0d480 100644
--- a/src/proc.c
+++ b/src/proc.c
@@ -76,11 +76,11 @@ int get_proc_stat(struct domain *dom)
     int i = 0;
 
     if (dom->type == ISDOMAIN) {
-        if (snprintf(path, STAT_PATH_SIZE, "/proc/%lu/stat", dom->pid) < 0) {
+        if (snprintf(path, STAT_PATH_SIZE, "/proc/%u/stat", dom->pid) < 0) {
             return -1;
         }
     } else {
-         if (snprintf(path, STAT_PATH_SIZE, "/proc/%lu/task/%lu/stat",
+         if (snprintf(path, STAT_PATH_SIZE, "/proc/%u/task/%u/stat",
                       dom->ppid, dom->pid) < 0) {
             return -1;
         }
@@ -117,11 +117,13 @@ int get_proc_comm(struct domain *dom)
     char path[STAT_PATH_SIZE];
     int len;
 
-    if (snprintf(path, STAT_PATH_SIZE, "/proc/%lu/comm", dom->pid) < 0) {
+    if (snprintf(path, STAT_PATH_SIZE, "/proc/%u/comm", dom->pid) < 0) {
         return -1;
     }
 
     len = read_file(dom->vmname, DOMAIN_NAME_MAX, path);
-    dom->vmname[len - 1] = '\0';
+    if (len > 1) {
+        dom->vmname[len - 1] = '\0';
+    }
     return len;
 }
diff --git a/src/vcpu_stat.c b/src/vcpu_stat.c
index 39e0e982994c0e7682cd84cb02ab56c049cb1455..207656339cbb08e6d6a46b1888f1250c25344218 100644
--- a/src/vcpu_stat.c
+++ b/src/vcpu_stat.c
@@ -60,7 +60,7 @@ int get_vcpu_stat(struct domain *dom)
     char pid[PID_STRING_SIZE];
     FILE *fp = NULL;
 
-    if (snprintf(pid, PID_STRING_SIZE, "%lu", dom->pid) < 0) {
+    if (snprintf(pid, PID_STRING_SIZE, "%u", dom->pid) < 0) {
         return -1;
     }
     fp = fopen(KVM_VCPU_STAT_PATH, "r");
diff --git a/src/vmtop.c b/src/vmtop.c
index 5c5e3405fd81b259289352f9653ff11a1d682863..2682f2700c71b53f43fa8bfc401da22c90e18f75 100644
--- a/src/vmtop.c
+++ b/src/vmtop.c
@@ -276,7 +276,7 @@ static void print_field(int high_light)
 {
     int x = 3;    /* display x local */
     int y = 4;    /* display y local */
-    int attr_flag;
+    unsigned int attr_flag;
 
     for (int i = 0; i < FD_END; i++) {
         attr_flag = A_NORMAL;