When ran configure on Windows's Cygwin,I got the follow errors. The libmad is libmad-0.15.1b.Cygwin is full installed. Any ideas?

$ ./configure --host=mingw32 configure: WARNING: If you wanted to set the --build type, don't use --host. If a cross compiler is detected then cross compile mode will be used. checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... gawk checking whether make sets $(MAKE)... yes checking for mingw32-strip... no checking for strip... strip checking build system type... i686-pc-cygwin checking host system type... i386-pc-mingw32 checking for mingw32-gcc... no checking for gcc... gcc checking for C compiler default output file name... a.exe checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... .exe checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ANSI C... none needed checking for style of include used by make... GNU checking dependency style of gcc... gcc3 checking for a sed that does not truncate output... /usr/bin/sed checking for egrep... grep -E checking for ld used by gcc... /usr/i686-pc-cygwin/bin/ld.exe checking if the linker (/usr/i686-pc-cygwin/bin/ld.exe) is GNU ld... yes checking for /usr/i686-pc-cygwin/bin/ld.exe option to reload object files... -r checking for BSD-compatible nm... nm checking whether ln -s works... yes checking how to recognise dependent libraries... file_magic file format pei*-i38 6(.*architecture: i386)? checking how to run the C preprocessor... /lib/cpp configure: error: C preprocessor "/lib/cpp" fails sanity check See `config.log' for more details.