Not part of the client build!

Preliminary, non-portable support for compiling JS.xs into a C file.

js/src/perlconnect/Makefile.ref

@@ -59,11 +59,14 @@ PC_HFILES =		\
 
 HFILES = $(PC_HFILES)
 
-# also make JS.c from JS.xs here?
 PC_CFILES =	\
 	jsperl.c \
+	JS.c \
 	$(NULL)
 
+JS.c: JS.xs typemap
+	perl /usr/lib/perl5/ExtUtils/xsubpp -typemap /usr/lib/perl5/ExtUtils/typemap -typemap typemap JS.xs > JS.c
+
 LIB_CFILES  = $(PC_CFILES)
 
 PROG_FILE = js