AC_CHECK_LIB(z, gzopen,, AC_MSG_ERROR([*** zlib is missing]))
-CXXFLAGS="$CXXFLAGS -DDATA_PREFIX='\"$datatdir/supertux\"'"
+CXXFLAGS="$CXXFLAGS -DDATA_PREFIX='\"$datadir/supertux\"'"
dnl Checks for library functions.
AC_CHECK_FUNCS(mkdir strdup strstr)