Hi there! A ./configure in the fptools root directory gives me $ ./configure *** The top of your build tree is: /home/Administrator/fucker checking build system type... i686-pc-cygwin checking host system type... i686-pc-cygwin checking target system type... i686-pc-cygwin Canonicalised to: i386-unknown-cygwin32 checking for ghc... /cygdrive/c/ghc/ghc-5.02.2/bin/ghc checking version of ghc... 5.02.2 checking for nhc... no checking for nhc98... no checking for hbc... no checking whether #! works in shell scripts... yes checking for perl... /bin/perl checking if your perl works in shell scripts... yes checking for gcc... gcc checking for C compiler default output... a.exe checking whether the C compiler works... yes checking whether we are cross compiling... no checking for executable suffix... .exe checking for object suffix... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking whether you have an ok gcc... yes checking how to run the C preprocessor... gcc -E checking whether gcc accepts -mwin32... yes checking whether gcc accepts -mno-cygwin... yes checking for ok way to do context diffs... diff -C 1 checking for find... /usr/bin/find checking for bison... bison -y checking for flex... flex checking for a BSD compatible install... /usr/bin/install -c checking for ar... /usr/bin/ar checking whether ln -s works... yes checking for sed... /usr/bin/sed checking for time... no checking for gtar... no checking for tar... /usr/bin/tar checking for gzip... /usr/bin/gzip checking for openjade... no checking for jade... no checking for DocBook CATALOG... no Warning: You will not be able to build the documentation. checking for happy... /cygdrive/c/happy/happy-1.11/bin/happy checking for version of happy... 1.11 checking for ANSI C header files... no checking for Files.h... no checking for arpa/inet.h... no checking for assert.h... no checking for console.h... no checking for ctype.h... no checking for dirent.h... no checking for errno.h... no checking for fcntl.h... no checking for float.h... no checking for ftw.h... no checking for grp.h... no checking for ieee754.h... no checking for inttypes.h... no checking for limits.h... no checking for malloc.h... no checking for memory.h... no checking for nlist.h... no checking for pascal.h... no checking for pwd.h... no checking for sgtty.h... no checking for siginfo.h... no checking for signal.h... no checking for stat.h... no checking for stdint.h... no checking for stdlib.h... no [...] Why doesnt the configure script recognize the header files? Compiling programs using gcc works fine as usual. Does somebody know what's wrong here? Thanks Johannes