Dependencies
------------
GNU Make >= 3.81 (prereleases of 3.81 also work)
GNU Sed
GNU Gettext (>= 0.16)
GNU M4 (>= 1.4.5)
GNU Guile (>= 1.6)
GNU Awk
Po4a 0.34
Libxml2 (>= 2.6.24, needed for XHTML validation only)
W3C XHMTL 1.0 DTDs (needed for XHTML validation only)
CVS (>= 1.12.9, needed if VCS operations are enabled)
