Add missing const to strdup() in oil.y

diff --git a/src/oil.y b/src/oil.y
index 6a247b1c87299c5a42a74ca4008e9e2a7dbda0ca..de751f09afb0ea37e58116b2105852c9dd08adc5 100644 (file)
--- a/src/oil.y
+++ b/src/oil.y
@@ -46,7 +46,7 @@ LICENSE TERMS
 
 /* Define strdup if it isn't available */
 #ifndef HAVE_STRDUP
-char* strdup(char* s)
+char* strdup(const char* s)
 {
   char* t=malloc(strlen(s)+1);
   if(t) strcpy(t,s);