--- asymptote-2.13/prc/PRCdouble.cc~	2011-06-19 15:40:51.000000000 +0200
+++ asymptote-2.13/prc/PRCdouble.cc	2011-06-20 08:40:37.743723350 +0200
@@ -24,7 +24,7 @@
 
 #ifdef WORDS_BIGENDIAN
 #ifndef HAVE_MEMRCHR
-void *memrchr(const void *buf,int c,size_t count)
+const void *memrchr(const void *buf,int c,size_t count)
 {
   unsigned char
       *pcBuffer=(unsigned char *)buf,
--- asymptote-2.13/prc/PRCdouble.h~	2011-06-19 15:40:51.000000000 +0200
+++ asymptote-2.13/prc/PRCdouble.h	2011-06-20 08:44:40.604913141 +0200
@@ -133,7 +133,7 @@
 
 #ifdef WORDS_BIGENDIAN
 #ifndef HAVE_MEMRCHR
-void *memrchr(const void *,int,size_t);
+const void *memrchr(const void *,int,size_t);
 #endif
 #endif