I've refreshed both my amd64 karmic schroot and pbuilder to confirm that the bug is still present. Failure to install the libghc6-utf8-string-prof build-dependency is causing the FTBFS. From the relevant portion of the pbuilder session: --- I: Copying back the cached apt archive contents I: Copying source file I: copying [/home/crimsun/Code/merges/haskell-x11-xft_0.3-3.dsc] I: copying [/home/crimsun/Code/merges/haskell-x11-xft_0.3.orig.tar.gz] I: copying [/home/crimsun/Code/merges/haskell-x11-xft_0.3-3.diff.gz] I: Extracting source gpg: new configuration file `/tmp/buildd/.gnupg/gpg.conf' created gpg: WARNING: options in `/tmp/buildd/.gnupg/gpg.conf' are not yet active during this run gpg: Signature made Sun Mar 1 16:34:02 2009 UTC using DSA key ID 4743206C gpg: Can't check signature: public key not found dpkg-source: extracting haskell-x11-xft in haskell-x11-xft-0.3 dpkg-source: info: unpacking haskell-x11-xft_0.3.orig.tar.gz dpkg-source: info: applying haskell-x11-xft_0.3-3.diff.gz I: Building the package dpkg-buildpackage: set CFLAGS to default value: -g -O2 dpkg-buildpackage: set CPPFLAGS to default value: dpkg-buildpackage: set LDFLAGS to default value: -Wl,-Bsymbolic-functions dpkg-buildpackage: set FFLAGS to default value: -g -O2 dpkg-buildpackage: set CXXFLAGS to default value: -g -O2 dpkg-buildpackage: source package haskell-x11-xft dpkg-buildpackage: source version 0.3-3 dpkg-buildpackage: source changed by Joachim Breitner