i briefly checked this and it does not work, because the libraries are built in 64-bit mode, while plt scheme is in 32-bit. the linker complaints if we set the 32-bit mode and want to link 64-bit libraries. you can either try installing all the libraries in 32-bit mode, which is probably a lot of work, or wait until plt scheme compiles in 64-bit.try adding env.Append(LINKFLAGS = ' -m32 ') to the SConstruct file.
best, gabor
