TerraGear CVS compile problem under Cygwin

I am trying to build TerraGear using the current version of Cygwin.  I have 
downloaded the current TerraGear CVS version and am using the following 
other packages:

gpc232.zip
gts-0.7.4.tar.gz
newmat11.tar.gz
plib-1.8.4.tar.gz
SimGear-0.3.9.tar.gz

All of these have already been compiled without errors and installed in my 
/usr/local/lib directory.  I then successfully executed:

./autogen.sh
LDFLAGS="-L/usr/local/lib" ./configure
make

Unfortunately, compilation goes for a while and then stops with the 
following error:

Making all in MergerClipper
make[3]: Entering directory 
`/usr/local/source/terragear/src/Prep/MergerClipper'

if g++ -DHAVE_CONFIG_H -I. -I. -I../../../src/Include -I../../../src/Lib    
-g -O2 -MT testmerger.o -MD -MP -MF ".deps/testmerger.Tpo" -c -o 
testmerger.o testmerger.cxx; \
then mv -f ".deps/testmerger.Tpo" ".deps/testmerger.Po"; else rm -f 
".deps/testmerger.Tpo"; exit1; fi
In file included from