Hello again, now that I had installed libsm-dev and libxmu-dev, building a Gears binary worked well. Since the problem didn't seem related to the GHC version, I deinstalled the GHC backports and installed GHC from sarge again which is 6.2.2. However, with GHC 6.2.2 I got these error messages during compiling Gears.hs: /tmp/ghc10821.hc: In function `sfcm_ret': /tmp/ghc10821.hc:1098: warning: assignment discards qualifiers from pointer target type /tmp/ghc10821.hc: In function `sfcf_ret': /tmp/ghc10821.hc:1216: warning: assignment discards qualifiers from pointer target type /tmp/ghc10821.hc: In function `sfc8_ret': /tmp/ghc10821.hc:1334: warning: assignment discards qualifiers from pointer target type /tmp/ghc10821.hc: In function `Main_info_entry': /tmp/ghc10821.hc:1443: warning: assignment discards qualifiers from pointer target type What does this have to say? Best wishes, Wolfgang