Pretty Poly 3D Modeller

When I try to compile under Linux, i get the following
error:

c++ -DPACKAGE=\"ppe\" -DVERSION=\"0.0.1\" -DHAVE_BOOL=1
-DHAVE_LIBPLIBUL=1 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DHAVE_LIBJPEG=1
-DHAVE_LIBZ=1 -DHAVE_LIBPNG=1 -DSTDC_HEADERS=1 -DHAVE_GL_GL_H=1
-DHAVE_GL_GLUT_H=1 -DHAVE_PNG_H=1 -DHAVE_JPEGLIB_H=1 -I. -I.
-I/usr/local/include -I.. -I/usr/include/python -g -O2 -O6
-Wall -c ppeEventHandler.cxx
ppeEventHandler.cxx: In method `void ppeEventHandler::showManual()':
ppeEventHandler.cxx:709: implicit declaration of function `int
ulFileExists(...)'
make[2]: *** [ppeEventHandler.o] Error 1
make[2]: Leaving directory `/usr/local/src/ppe/src/gui'