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SDCC Manual 2.4.4 Building SDCC using Cygwin and Mingw32 For building and installing a Cygwin executable follow the instructions for Linux. On Cygwin a ''native'' Win32-binary can be built, which will not need the Cygwin-DLL. For the necessary 'configure' options see section 'configure options' or the script 'sdcc/support/scripts/sdcc_cygwin_mingw32'. In order to install Cygwin on Windows download setup.exe from www.cygwin.com http://www.cygwin.com/. Run it, set the ''default text file type'' to ''unix'' and download/install at least the following packages. Some packages are selected by default, others will be automatically selected because of dependencies with the manually selected packages. Never deselect these packages! flex bison gcc ; version 3.x is fine, no need to use the old 2.9x binutils ; selected with gcc make rxvt ; a nice console, which makes life much easier under windoze (see below) man ; not really needed for building SDCC, but you'll miss it sooner or later less ; not really needed for building SDCC, but you'll miss it sooner or later svn ; only if you use Subversion access If you want to develop something you'll need: python ; for the regression tests gdb ; the gnu debugger, together with the nice GUI ''insight'' openssh ; to access the CF or commit changes autoconf and autoconf-devel ; if you want to fight with 'configure', don't use autoconf-stable! rxvt is a nice console with history. Replace in your cygwin.bat the line bash --login -i  with (one line): rxvt -sl 1000 -fn "Lucida Console-12" -sr -cr red      -bg black -fg white -geometry 100x65 -e bash --login Text selected with the mouse is automatically copied to the clipboard, pasting works with shift-insert. The other good tip is to make sure you have no //c/-style paths anywhere, use /cygdrive/c/ instead. Using // invokes a network lookup which is very slow. If you think ''cygdrive'' is too long, you can change it with e.g. mount -s -u -c /mnt SDCC sources use the unix line ending LF. Life is much easier, if you store the source tree on a drive which is mounted in binary mode. And use an editor which can handle LF-only line endings. Make sure not to commit files with windows line endings. The tabulator spacing used in the project is 8. Although a tabulator spacing of 8 is a sensible choice for programmers (it's a power of 2 and allows to display 8/16 bit signed variables without loosing columns) the plan is to move towards using only spaces in the source.