configure errors on 64 bit cygwin

I'm getting configure errors on 64 bit cygwin. I just updated cygwin.

First, I used the configure args in INSTALL_windows_cygwin.txt:

     ./configure botan_CFLAGS="-I/usr/include/botan-1.10" \
               botan_LIBS="/usr/lib/libbotan-1.10.dll.a"

In config.log, that gives:

configure:5205: g++ -o conftest.exe -g -O2 -Wall -W -Wno-unused  -I/usr/include/botan-1.10  conftest.cpp -lz  /usr/lib/libbotan-1.10.dll.a >&5
g++.exe: error: /usr/lib/libbotan-1.10.dll.a: No such file or directory

So I used 

     ./configure botan_CFLAGS="-I/usr/include/botan-1.10" \
       botan_LIBS="-lbotan-1.10"

That gives:

configure:5205: g++ -o conftest.exe -g -O2 -Wall -W -Wno-unused  -I/usr/include/botan-1.10  conftest.cpp -lz  -lbotan-1.10 >&5
C:\tmp\ccgldZhS.o: In function `LibraryInitializer':
/usr/include/botan-1.10/botan/init.h:41: undefined reference to `Botan::LibraryInitializer::initialize(std::string const&)'
C:\tmp\ccgldZhS.o: In function `~LibraryInitializer':
/usr/include/botan-1.10/botan/init.h:43: undefined reference to `Botan::LibraryInitializer::deinitialize()'
collect2.exe: error: ld returned 1 exit status


Any clues?

-- 
-- Stephe