fontbox ~ # emerge -v libdts
Calculating dependencies ...done!
>>> emerge (1 of 1) media-libs/libdts-0.0.2-r3 to /
>>> md5 files   ;-) libdts-0.0.2-r3.ebuild
>>> md5 files   ;-) files/libdts-0.0.2-freebsd.patch
>>> md5 files   ;-) files/digest-libdts-0.0.2-r3
>>> md5 files   ;-) files/libdts-0.0.2-visibility.patch
>>> md5 files   ;-) files/libdts-0.0.2-libtool.patch
>>> md5 src_uri ;-) libdts-0.0.2.tar.gz
>>> Unpacking source...
>>> Unpacking libdts-0.0.2.tar.gz to /var/tmp/portage/libdts-0.0.2-r3/work
 * Applying libdts-0.0.2-libtool.patch ...                                                                                                             [ ok ]
 * Applying libdts-0.0.2-freebsd.patch ...                                                                                                             [ ok ]
 * Running eautoreconf in '/var/tmp/portage/libdts-0.0.2-r3/work/libdts-0.0.2' ...
 * eaclocal: 'm4' does not exist
 * Running aclocal -I m4 ...                                                                                                                           [ !! ]

 * Failed Running aclocal !
 *
 * Include in your bugreport the contents of:
 *
 *   /var/tmp/portage/libdts-0.0.2-r3/temp/aclocal-3793.out


!!! ERROR: media-libs/libdts-0.0.2-r3 failed.
!!! Function autotools_run_tool, Line 198, Exitcode 0
!!! Failed Running aclocal !
!!! If you need support, post the topmost build error, NOT this status message.

>>>>>>>>>>>>>>>>>

fontbox ~ # cat /var/tmp/portage/libdts-0.0.2-r3/temp/aclocal-3793.out
***** aclocal *****

aclocal: couldn't open directory `m4': No such file or directory