...

...

./boost/config/requires_threads.hpp:29:4: error: #error "Threading support unavaliable: it has been explicitly disabled with BOOST_DISABLE_THREADS"

...

This may be an issue with 4.3.2 as it works fine with 3.4.4.

AFAIR, there is no pthreads in gcc-4 on cygwin.

I agree with that. I tried it too for a couple of weeks, but the current gcc 4.3.2 version installed in cygwin was built without pthread. Try a "$gcc-4.exe --v". On my machine it returns: Using built-in specs. Target: i686-pc-cygwin Configured with: /gnu/gcc/release/gcc4-4.3.2-1/src/gcc-4.3.2/configure --srcdir=/gnu/gcc/release/gcc4-4.3.2-1/src/gcc-4.3.2 --prefix=/usr --exec-prefix=/us --bindir=/usr/bin --sbindir=/usr/sbin --libexecdir=/usr/sbin --localstatedir=/var --sysconfdir=/etc --datadir=/usr/share --infodir=/usr/share/info --mandi =/usr/share/man -v --with-gmp=/usr --with-mpfr=/usr --enable-bootstrap --enable-version-specific-runtime-libs --with-slibdir=/usr/bin --libexecdir=/usr/lib --enable-static --enable-shared --enable-shared-libgcc --enable-__cxa_atexit --with-gnu-ld --with-gnu-as --with-dwarf2 --disable-sjlj-exceptions --enable-l nguages=ada,c,c++,fortran,java,objc,obj-c++ --disable-symvers --enable-libjava --program-suffix=-4 Thread model: single gcc version 4.3.2 20080827 (alpha-testing) 1 (GCC) The line saying "Thread model: single" says it all... HTH, Florent Arnold & Richter Cine Technik GmbH & Co. Betriebs KG Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRA 57918 Personlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRB 54477 Geschaftsfuhrer: Prof. Dr. Dejan Ilic; Franz Kraus; Jens Schafer