mingw build failure

[Sam S. <sd...@gn...>]

cannot link with mingw:

gcc -mno-cygwin -W -Wswitch -Wcomment -Wpointer-arith -Wimplicit -Wreturn-type
-Wno-sign-compare -O2 -fexpensive-optimizations -D_WIN32 -DUNICODE -DDYNAMIC_FFI
 -DNO_GETTEXT -I. -x none spvw.o spvwtabf.o spvwtabs.o spvwtabo.o eval.o control
.o encoding.o pathname.o stream.o socket.o io.o array.o hashtabl.o list.o packag
e.o record.o weak.o sequence.o charstrg.o debug.o error.o misc.o time.o predtype
.o symbol.o lisparit.o i18n.o foreign.o win32aux.o built.o ari80386.o modules.o
libcharset.a libavcall.a libcallback.a -lncurses  -luser32 -lws2_32 -lole32 -lol
eaut32 -luuid -L/usr/local/libsigsegv-mingw/lib -lsigsegv -o lisp.exe
spvw.o(.text+0x2053):spvw.c: undefined reference to `_errno'
collect2: ld returned 1 exit status

there are no warnings compiling spvw.c
is there a way to figure out what is going on?

-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
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