creating Makefile
creating jconfig.h
./libtool-wrap --mode=compile i686-pc-linux-gnu-gcc -march=prescott -O2 -pipe -fomit-frame-pointer  -I. -c ./jcapimin.c
./libtool-wrap --mode=compile i686-pc-linux-gnu-gcc -march=prescott -O2 -pipe -fomit-frame-pointer  -I. -c ./jcapistd.c
./libtool-wrap --mode=compile i686-pc-linux-gnu-gcc -march=prescott -O2 -pipe -fomit-frame-pointer  -I. -c ./jctrans.c
libtool: compile: unable to infer tagged configuration
libtool: compile: specify a tag with `--tag'
make: *** [jcapistd.lo] Error 1
make: *** Waiting for unfinished jobs....
libtool: compile: unable to infer tagged configuration
libtool: compile: specify a tag with `--tag'
make: *** [jcapimin.lo] Error 1
libtool: compile: unable to infer tagged configuration
libtool: compile: specify a tag with `--tag'
make: *** [jctrans.lo] Error 1

!!! ERROR: media-libs/jpeg-6b-r7 failed.
Call stack:
  ebuild.sh, line 1539:   Called dyn_compile
  ebuild.sh, line 939:   Called src_compile
  jpeg-6b-r7.ebuild, line 34:   Called die

!!! make failed
!!! If you need support, post the topmost build error, and the call stack if relevant.