Build problem, 32-bit:
.....
/usr/bin/ld: apl-Quad_FFT.o: in function `Quad_FFT::Quad_FFT()':
/home/wheagy/apl_svn/apl/trunk/src/Quad_FFT.cc:360:(.text+0x9e):
undefined reference to `vtable for Quad_FFT'
collect2: error: ld returned 1 exit status
make[3]: *** [Makefile:1567: apl] Error 1
make[3]: Leaving directory '/home/wheagy/apl_svn/apl/trunk/src'
make[2]: *** [Makefile:5425: all-recursive] Error 1
make[2]: Leaving directory '/home/wheagy/apl_svn/apl/trunk/src'
make[1]: *** [Makefile:561: all-recursive] Error 1
make[1]: Leaving directory '/home/wheagy/apl_svn/apl/trunk'
make: *** [Makefile:449: all] Error 2