When running make I get the following message:

# INTLTOOL_MAKEFILE
Making all in stereo
make[1]: Entering directory `/home/pacho/sound-theme-freedesktop-0.7/stereo'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/pacho/sound-theme-freedesktop-0.7/stereo'
Making all in po
make[1]: Entering directory `/home/pacho/sound-theme-freedesktop-0.7/po'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/pacho/sound-theme-freedesktop-0.7/po'
make[1]: Entering directory `/home/pacho/sound-theme-freedesktop-0.7'
/usr/bin/intltool-merge  ; /usr/bin/intltool-merge ./po index.theme.in index.theme -d -u -c ./po/.intltool-merge-cache
Usage: intltool-merge [OPTION]... PO_DIRECTORY FILENAME OUTPUT_FILE
Generates an output file that includes some localized attributes from an
untranslated source file.

Mandatory options: (exactly one must be specified)
  -b, --ba-style         includes translations in the bonobo-activation style
  -d, --desktop-style    includes translations in the desktop style
  -k, --keys-style       includes translations in the keys style
  -s, --schemas-style    includes translations in the schemas style
  -r, --rfc822deb-style  includes translations in the RFC822 style
      --quoted-style     includes translations in the quoted string style
      --quotedxml-style  includes translations in the quoted xml string style
  -x, --xml-style        includes translations in the standard xml style

Other options:
  -u, --utf8             convert all strings to UTF-8 before merging 
                         (default for everything except RFC822 style)
  -p, --pass-through     deprecated, does nothing and issues a warning
  -m, --multiple-output  output one localized file per locale, instead of 
	                 a single file containing all localized elements
  -c, --cache=FILE       specify cache file name
                         (usually $top_builddir/po/.intltool-merge-cache)
  -q, --quiet            suppress most messages
      --help             display this help and exit
      --version          output version information and exit

Report bugs to http://bugs.launchpad.net/intltool
Generating and caching the translation database
Merging translations into index.theme.
make[1]: Leaving directory `/home/pacho/sound-theme-freedesktop-0.7'

The problem is caused by this line in Makefile.am:

%.theme: %.theme.in
        $(INTLTOOL_MERGE) $(wildcard $(top_srcdir)/po/*.po) ; $(INTLTOOL_MERGE)
$(top_srcdir)/po $< $@ -d -u -c $(top_builddir)/po/.intltool-merge-cache

Looks like $(wildcard $(top_srcdir)/po/*.po) ends returning nothing, causing
the warning :S