[Nel] missing file "water_imp.cpp"

[Dennis McGregor]

I'm managing to compile the the Nel engine (after a full upgrade to
woody the problems with pthread.h disappeared), but only if disable 3d
during the compile process. Otherwise I get an error about a file that
doesn't exist either in the tar that I'm using or on the nevrax.org cvsweb:

c++ -DHAVE_CONFIG_H -I. -I. -I../../include -I../../src
-I/usr/include/freetype2 -O3 -DNL_RELEASE -ftemplate-depth-24
-Wno-multichar -D_REENTRANT -I/usr/X11R6/include
-I/usr/local/STLport-4.0/stlport/ -Wp,-MD,.deps/water_height_map.pp -c
water_height_map.cpp -o water_height_map.o >/dev/null 2>&1
mv -f .libs/water_height_map.lo water_height_map.lo
make[3]: *** No rule to make target `water_imp.cpp', needed by
`water_imp.lo'.  Stop.

Dennis.