Hi, I am trying to learn yampa and downloaded the package, also containing afrob from the homepage. I installed arrows and HGL over cabal. Now I go into the afrob directory and type make, I get: make -C src make[1]: Entering directory `/home/ls/tmp/Yampa-0.9.1/afrob-0.2/src' make -C Common make[2]: Entering directory `/home/ls/tmp/Yampa-0.9.1/afrob-0.2/src/Common' ghc -M -optdep-f -optdep.hs_dependences -optdep--exclude-directory=/usr/local/lib/ghc/imports/arrow:/usr/local/lib/ghc/imports/afrp -fglasgow-exts -O -package lang -i/usr/local/lib/ghc/imports/arrow:/usr/local/lib/ghc/imports/afrp AFrob.hs AFrobDiagnostics.hs AFrobPhysicalDimensions.hs AFrobRobotIO.hs AFrobRobotSimFake.hs || (rm -f .hs_dependences ; exit 1) on the commandline: Warning: -optdep-f is deprecated: Use -dep-makefile instead <command line>: unknown package: lang ghc -c -fglasgow-exts -O -package lang -i/usr/local/lib/ghc/imports/arrow:/usr/local/lib/ghc/imports/afrp -o AFrob.o AFrob.hs <command line>: unknown package: lang make[2]: *** [AFrob.o] Error 1 make[2]: Leaving directory `/home/ls/tmp/Yampa-0.9.1/afrob-0.2/src/Common' make[1]: *** [Common] Error 2 make[1]: Leaving directory `/home/ls/tmp/Yampa-0.9.1/afrob-0.2/src' make: *** [src] Error 2 So I suppose I am missing the "lang" package ?!? How do I get it? Thanks! Nathan