g++ -O -I../STUBS -DFFT_NONE -c pppm.cpp
pppm.cpp: En constructor `PPPM::PPPM(int, char**)':
pppm.cpp:56: error: `atof' undeclared (first use this function)
pppm.cpp:56: error: (Each undeclared identifier is reported only once for each
   function it appears in.)
make[1]: *** [pppm.o] Error 1
make[1]: Leaving directory `/home/cualquiera/lammps/lammps-1Oct06/src/Obj_serial'
make: *** [serial] Error 2