1 files changed, 3 insertions, 2 deletions
diff --git a/glgrav.cpp b/glgrav.cpp
index 3586e7d..8e7e6a7 100644
--- a/glgrav.cpp
+++ b/glgrav.cpp
@@ -31,6 +31,7 @@ static const char id[]="$Id$";
 
 #include <cstdarg>
 #include <ctime>
+#include <cstring>
 
 static Config		config;
 static vector<Mass>	mass;
@@ -114,7 +115,7 @@ static void	HandleCollision(Config::Collide collide,
 				vector<bool>& del,vector<Mass>& mv,
 				Mass& m1, Mass& m2, int idx1, int idx2);
 static void	SetOption(int opt, string text, bool flag);
-static void	GLPrint(char *fmt,...);
+static void	GLPrint(const char *fmt,...);
 
 
 int main(int argc, char *argv[])
@@ -934,7 +935,7 @@ static void Update(void)
 }
 
 
-static void GLPrint(char *fmt,...)
+static void GLPrint(const char *fmt,...)
 {
     char s[256];
     va_list va;