I am trying to compile Ocaml 3.11 on Cygwin. However I get the following
error when I run "make world":

---

(snip a whole bunch more undefined references)
....
/tmp/ccoBzdkK.o:interp.c:(.text+0x1dcf): undefined reference to
`_caml_debugger'

/tmp/ccoBzdkK.o:interp.c:(.text+0x1dda): undefined reference to
`_caml_start_cod
e'
/tmp/ccoBzdkK.o:interp.c:(.text+0x1de6): undefined reference to
`_caml_saved_cod
e'
/tmp/ccoBzdkK.o:interp.c:(.text+0x1e23): undefined reference to
`_caml_extern_sp
'
/tmp/ccoBzdkK.o:interp.c:(.text+0x1e2f): undefined reference to
`_caml_debugger'

/tmp/ccoBzdkK.o:interp.c:(.text+0x1e3a): undefined reference to
`_caml_start_cod
e'
/tmp/ccoBzdkK.o:interp.c:(.text+0x1e46): undefined reference to
`_caml_saved_cod
e'
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../libcygwin.a(libcmain.o):(.text+0xab):
 undefined reference to `_WinMain@16'
collect2: ld returned 1 exit status
make[2]: *** [interp.o] Error 1
make[2]: Leaving directory `/home/ocaml-3.11.0/byterun'
make[1]: *** [coldstart] Error 2
make[1]: Leaving directory `/home/ocaml-3.11.0'
make: *** [world] Error 2

---

What could be the cause of this error?