Hi, I'm trying to compile it on Max OS X ./configure checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for library containing clock_gettime... no checking build system type... i386-apple-darwin12.2.0 checking host system type... i386-apple-darwin12.2.0 checking for gcc... (cached) gcc checking whether we are using the GNU C compiler... (cached) yes checking whether gcc accepts -g... (cached) yes checking for gcc option to accept ISO C89... (cached) none needed checking what CFLAGS should we use... -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign checking how to run the C preprocessor... gcc -E checking for a BSD-compatible install... /usr/bin/install -c checking for ranlib... ranlib checking for flex... flex checking for bison... bison checking for gm4... gm4 configure: error: Cannot determine correct system configuration. Please use --with-sysconfig to set it manually. --- LLVM-GCC: build 2336 Clang: 4.1 build 421 Best Regards Stefan