compile error

gistfile1.txt

ocamlc -g    -c  netexn.ml
if [ "Xnetsys_c.o netsys_c_win32.o netsys_c_htab.o netsys_c_queue.o netsys_c_mem.o netsys_c_xdr.o" = "X" ]; then \
		ocamlc -g    -a -o netsys.cma  netsys_conf.cmo netsys_types.cmo netlog.cmo netexn.cmo netsys_impl_util.cmo netsys_signal.cmo netsys_posix.cmo netsys_win32.cmo netsys.cmo netsys_pollset.cmo netsys_pollset_posix.cmo netsys_pollset_win32.cmo netsys_pollset_generic.cmo netsys_mem.cmo netsys_xdr.cmo netsys_tmp.cmo; \
	else \
		..//tools/mkstublib -o netsys netsys_conf.cmo netsys_types.cmo netlog.cmo netexn.cmo netsys_impl_util.cmo netsys_signal.cmo netsys_posix.cmo netsys_win32.cmo netsys.cmo netsys_pollset.cmo netsys_pollset_posix.cmo netsys_pollset_win32.cmo netsys_pollset_generic.cmo netsys_mem.cmo netsys_xdr.cmo netsys_tmp.cmo netsys_c.o netsys_c_win32.o netsys_c_htab.o netsys_c_queue.o netsys_c_mem.o netsys_c_xdr.o -lpthread; \
	fi
ld: warning: -read_only_relocs cannot be used with x86_64
ocamlc -g  -I ../../ocamlpcre/lib -I ../netsys -c  netstring_pcre.mli
File "netstring_pcre.mli", line 15, characters 14-25:
Error: Unbound module Pcre
make[3]: *** [netstring_pcre.cmi] Error 2
make[2]: *** [all] Error 1
make[1]: *** [rec] Error 1
make: *** [all] Error 2