To compile Crypto++ 3.0 with EGCS 1.1, you need to modify the
system header file <memory> to enable auto_ptr. Just comment out the four
#if and #endif lines around the auto_ptr class definition. You also need
to fix a couple of typos in the auto_ptr definition. Change the line

  X* release const __STL_NOTHROW { owns = false; return ptr }

to

  X* release() const __STL_NOTHROW { owns = false; return ptr; }

Also, there may be a bug in the EGCS optimizer. If Crypto++ fails
the validation test or crashes during it, try recompiling the file
integer.cpp with optimizations turned off and then doing a
remake.

EGCS does not have good template support on non-ELF platforms, so
compiling Crypto++ on those platforms with EGCS will likely fail.