Hi, At home now, of course with no Visual Studio, and as a result: scons: Reading SConscript files ... Checking for architecture... Windows implies x86 Checking for operating system... win32 Checking for Scons binary... "C:\Python24\scons.bat" Checking for Darcs binary... "c:\bin\darcs.exe" Checking for Darcs version... Found version 1.0.7 (release) . Checking for Subversion binary... "C:\Program Files\Subversion\bin\svn.exe" Checking for Subversion version... Found version 1.3.2. Checking for GHC binary... "C:\ghc\ghc-6.4.2\bin\ghc.exe" Checking for GHC version 6.4.1 or later... Found version 6.4.2. Checking whether byte ordering is bigendian... failed Checking size of char... failed Checking size of short... failed Checking size of int... failed Checking size of long... failed Checking size of long long... failed Checking size of float... failed Checking size of double... failed Checking size of void*... failed Checking for pthread_create() in C library pthread... no Generating config.h with the following settings: WORDS_BIGENDIAN None HAVE_LIBPTHREAD 0 SIZEOF_LONG_LONG None SIZEOF_LONG None WIN32 1 SIZEOF_VOIDP None SIZEOF_CHAR None SIZEOF_DOUBLE None SIZEOF_FLOAT None SIZEOF_INT None HAVE_GCC_LABELS 0 SIZEOF_SHORT None TypeError: int argument required: File "SConstruct", line 38: configure(env, Configure, ARGUMENTS) # Configure File "C:\Neil\yhc-devel\build\configure.py", line 97: config_h_build('config.h', 'config.h.new.in', vals) File "C:\Neil\yhc-devel\build\config_h.py", line 21: text = config_h_in.read() % defines I guess we should check for a C compiler first. Just for note, I'll probably try installing gcc rather than Visual Studio (in fact gcc might already be installed here) - will gcc + Windows work at all? Thanks Neil