This incorporates Posix math support into ash. The Posix math support

was written by Aaron Lehmann <aaronl@vitelus.com> for busybox.  This
patch makes a few trivial changes to Aaron's code so that it can be
used (in theory) by the other shells as well...
 -Erik

include/libbb.h

@@ -212,6 +212,8 @@ char *xreadlink(const char *path);
 char *concat_path_file(const char *path, const char *filename);
 char *last_char_is(const char *s, int c);
 
+extern long arith (const char *startbuf);
+
 typedef struct file_headers_s {
 	char *name;
 	char *link_name;