title: gdb building with expat
body: <p>I can't seem to get the syntax right for building gdb on Windows 10 (mingw), with expat.  I downloaded expat sources and had no problems building.  The expat.h file is in /usr/local/include and the expat library (libexpat.a and libexpat.dll.a) ended up in /usr/local/lib</p>
  
  <p>My config is:
  ../gdb-7.7.1/configure --target=arm-linux-gnueabihf --prefix /c/sysGCC/output --with-python --with-expat --with-libexpat-prefix=/usr/local/lib --disable-nls</p>
  
  <p>But no matter what I try I always get a make error "libexpat is missing or unusable".  Does anyone spot the error???</p>