diff --git a/CMakeLists.txt b/CMakeLists.txt
index 65989f9..a02e5bf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,9 +1,10 @@
 cmake_minimum_required(VERSION 3.15.2)
 # 设置cxx编译器
 # 如果你使用别的编译器，请在这里修改
+set(CMAKE_C_COMPILER /usr/local/bin/gcc-9)
 set(CMAKE_CXX_COMPILER /usr/local/bin/g++-9)
 # 设置工程名称和语言
-project(LIBLBFGS VERSION 1.0.0 LANGUAGES CXX)
+project(LIBLBFGS VERSION 1.0.0)
 # 设置安装地址
 set(CMAKE_INSTALL_PREFIX /usr/local)
 # 添加编译选项
diff --git a/src/lib/config.h b/src/lib/config.h
new file mode 100644
index 0000000..68b9098
--- /dev/null
+++ b/src/lib/config.h
@@ -0,0 +1,3 @@
+#define HAVE_CONFIG_H
+/* #undef _MSC_VER */
+/* #undef USE_SSE */
diff --git a/src/lib/lbfgs.c b/src/lib/lbfgs.c
index e3075b7..88bd457 100644
--- a/src/lib/lbfgs.c
+++ b/src/lib/lbfgs.c
@@ -70,7 +70,7 @@ licence.
 #include <stdlib.h>
 #include <math.h>
 
-#include <lbfgs.h>
+#include "lbfgs.h"
 
 #ifdef  _MSC_VER
 #define inline  __inline
diff --git a/src/sample/sample.c b/src/sample/sample.c
index 90e36cd..129505f 100644
--- a/src/sample/sample.c
+++ b/src/sample/sample.c
@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include <lbfgs.h>
+#include "../lib/lbfgs.h"
 
 static lbfgsfloatval_t evaluate(
     void *instance,
diff --git a/src/sample/sample2.cpp b/src/sample/sample2.cpp
index ad7be97..07fc4f8 100644
--- a/src/sample/sample2.cpp
+++ b/src/sample/sample2.cpp
@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include <lbfgs.h>
+#include "../lib/lbfgs.h"
 
 class objective_function
 {
@@ -119,7 +119,7 @@ protected:
 
 #define N   100
 
-int main(int argc, char *argv)
+int main(int argc, char *argv[])
 {
     objective_function obj;
     return obj.run(N);