Calculating dependencies ...done!
>>> emerge (1 of 1) media-libs/jpeg-6b-r5 to /
>>> md5 files   ;) jpeg-6b-r5.ebuild
>>> md5 files   ;) jpeg-6b-r4.ebuild
>>> md5 files   ;) files/jpeg-6b-freebsd.patch
>>> md5 files   ;) files/jpeg-6b-gentoo.patch
>>> md5 files   ;) files/digest-jpeg-6b-r4
>>> md5 files   ;) files/digest-jpeg-6b-r5
>>> md5 src_uri ;) jpegsrc.v6b.tar.gz
>>> Unpacking source...
>>> Unpacking jpegsrc.v6b.tar.gz to /var/tmp/portage/jpeg-6b-r5/work
 * Applying jpeg-6b-freebsd.patch ...
 * Applying uClibc/libtool patches ...
 * Fixing ${S}/ltconfig ...
 * Applying jpeg-6b-gentoo.patch ...
>>> Source unpacked.
 * econf: updating jpeg-6b/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating jpeg-6b/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --host=i686-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --build=i686-pc-linux-gnu --enable-shared --enable-static
configure: error: static: invalid feature name


I also have encountered this. Here is my output of emerge jpeg.

The problem ocurred already in jpeg-6b-r4. 

Also, if I run the configure script in /var/tmp/portage/jpeg-6b-r5/work/jpeg-6b/ with the same options, except "--enable-static", the configure script completes fine.