diff -p -up Singular-3-1-0/kernel/febase.cc.orig Singular-3-1-0/kernel/febase.cc
--- Singular-3-1-0/kernel/febase.cc.orig	2009-07-15 15:19:03.000000000 -0300
+++ Singular-3-1-0/kernel/febase.cc	2009-07-15 15:19:14.000000000 -0300
@@ -745,7 +745,7 @@ FILE * feFopen(const char *path, const c
       if (pw_entry != NULL)
       {
         strcpy(longpath, pw_entry->pw_dir);
-        dir_sep = strchr(path, DIR_SEP);
+	dir_sep = strchr((char *)path, DIR_SEP);
         strcat(longpath, dir_sep);
         path = longpath;
       }
diff -p -up Singular-3-1-0/kernel/mpr_complex.cc.orig Singular-3-1-0/kernel/mpr_complex.cc
--- Singular-3-1-0/kernel/mpr_complex.cc.orig	2009-07-15 15:19:31.000000000 -0300
+++ Singular-3-1-0/kernel/mpr_complex.cc	2009-07-15 15:19:44.000000000 -0300
@@ -83,7 +83,7 @@ void gmp_float::setFromStr(const char * 
   BOOLEAN neg=false;
   if (*in == '-') { in++; neg=TRUE; }
   char *s;
-  if ((s=strchr(in,'E')) !=NULL)
+  if ((s=strchr((char *)in,'E')) !=NULL)
   {
     *s='e';
   }