diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4e88087
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.o
+fork
+execlp 
diff --git a/Makefile b/Makefile
index 251f4e0..e1ec215 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@
 # Makefile for base example
 #
 include ./make.h
-
+ 
 
 # 目标和源文件  
 TARGETS  = fork execlp  
@@ -10,7 +10,7 @@ SOURCES  = $(wildcard $(SRC_DIR)/*.c)  # 找到所有的 .c 文件
 OBJECTS  = $(patsubst $(SRC_DIR)/%.c,%.o,$(SOURCES)) # 将 .c 替换为 .o  
 
 # 默认目标  
-all: $(TARGETS)  
+all: $(TARGETS) 
 
 #  链接目标文件生成可执行文件  
 fork: fork.o  
diff --git a/make.h b/make.h
index 3fa0574..b9fa4c7 100644
--- a/make.h
+++ b/make.h
@@ -12,7 +12,7 @@
 ##############################################################
 
 
-BASE_DIR                     = $(pwd)
+BASE_DIR                     = $(shell pwd)
 TARGET_OS                    = OS_PTHREADS
 
 ##########################
@@ -34,7 +34,7 @@ COMMON_INCLUDE_DIRS  =                              \
 
 ifeq (${TARGET_OS}, OS_TMO)
 CC_DEBUG_FLAGS               = -g
-CC_OPTIMIZATION_FLAGS         = -O2
+CC_OPTIMIZATION_FLAGS        = -O2
 CC_WARNING_FLAGS             = -ansi                         \
 							   -Wall                         \
                                -Wunused                      \
@@ -120,8 +120,8 @@ LD                           = ldppc
 LD_FLAGS                     = -r
 AR                           = arppc
 AR_FLAGS                     = -r
-#MKDIR                        = mkdir
-#MKDIR_FLAGS                  = -p
+MKDIR                        = mkdir
+MKDIR_FLAGS                  = -p
 RM                           = rm
 RM_FLAGS                     = -f
 GENERAL_COMPILATION_SWITCHES = -DINCLUDE_IN_OSS              \
diff --git a/src/execlp.c b/src/execlp.c
index f9acbac..8f077bf 100644
--- a/src/execlp.c
+++ b/src/execlp.c
@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
-
+#include <sys/wait.h> 
 
 int main(int argc, char * argv[])
 {