diff --git a/chsrc.c b/chsrc.c
index c16ea16..204b018 100644
--- a/chsrc.c
+++ b/chsrc.c
@@ -584,8 +584,6 @@ pl_dotnet_getsrc (char* option)
 void
 pl_dotnet_setsrc (char* option)
 {
-  int index = 0; char* check_cmd = NULL;
-
   xy_error ("chsrc: 暂时无法为NuGet换源，若有需求，请您提交issue");
 }
 
@@ -1656,7 +1654,6 @@ main (int argc, char const *argv[])
   }
 
   const char* command = argv[1];
-  const char* target  = NULL;
 
   bool matched = false;
 
diff --git a/chsrc.h b/chsrc.h
index 1407fa1..bd4df1a 100644
--- a/chsrc.h
+++ b/chsrc.h
@@ -475,7 +475,7 @@ int
 dblary_maxidx(double* array, int size)
 {
   double maxval = array[0];
-  double maxidx = 0;
+  int maxidx = 0;
 
   for (int i=1; i<size; i++) {
     if (array[i]>maxval) {
diff --git a/xy.h b/xy.h
index ecde44f..2392f67 100644
--- a/xy.h
+++ b/xy.h
@@ -33,7 +33,7 @@
   static bool xy_on_windows = true;
   static bool xy_on_linux   = false;
   static bool xy_on_macos   = false;
-  static bool xy_on_bsds    = false;
+  static bool xy_on_bsd     = false;
 
   static char* xy_os_devnull = "nul";
 
@@ -45,7 +45,7 @@
   static bool xy_on_windows = false;
   static bool xy_on_linux   = true;
   static bool xy_on_macos   = false;
-  static bool xy_on_bsds    = false;
+  static bool xy_on_bsd     = false;
 
   static char* xy_os_devnull = "/dev/null";
 
@@ -56,7 +56,7 @@
   static bool xy_on_windows = false;
   static bool xy_on_linux   = false;
   static bool xy_on_macos   = true;
-  static bool xy_on_bsds    = false;
+  static bool xy_on_bsd     = false;
 
   // set xy_os_devnull
 
@@ -67,7 +67,7 @@
   static bool xy_on_windows = false;
   static bool xy_on_linux   = false;
   static bool xy_on_macos   = false;
-  static bool xy_on_bsds    = true;
+  static bool xy_on_bsd     = true;
 
   // set xy_os_devnull