* Unless --with-bzip2 is specified, use a copy of bzip2 in the

externals directory.  This is in particular useful because though
  most systems have bzip2/bunzip2, they don't always have libbz2,
  which we need for bsdiff/bspatch.

tests/common.sh.in

@@ -24,6 +24,10 @@ export NIX_BUILD_HOOK=
 export PERL=perl
 export TOP=$(pwd)/..
 export aterm_bin=@aterm_bin@
+export bzip2_bin_test="@bzip2_bin_test@"
+if test "${bzip2_bin_test:0:1}" != "/"; then
+    bzip2_bin_test=`pwd`/${bzip2_bin_test}
+fi
 export dot=@dot@
 export xmllint="@xmllint@"
 export xmlflags="@xmlflags@"