>>> Unpacking source...
>>> Unpacking gtkwave-3.1.6.tar.gz to /var/tmp/portage/sci-electronics/gtkwave-3.1.6/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/sci-electronics/gtkwave-3.1.6/work/gtkwave-3.1.6 ...
./configure --prefix=/usr --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --libdir=/usr/lib64 --build=x86_64-pc-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking if gtk1 or gtk2 should be used... gtk2
checking if ae2 support should be used... no
checking for gawk... (cached) gawk
checking for x86_64-pc-linux-gnu-gcc... x86_64-pc-linux-gnu-gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether x86_64-pc-linux-gnu-gcc accepts -g... yes
checking for x86_64-pc-linux-gnu-gcc option to accept ANSI C... none needed
checking for style of include used by make... GNU
checking dependency style of x86_64-pc-linux-gnu-gcc... gcc3
checking whether make sets $(MAKE)... (cached) yes
checking for flex... flex
checking for yywrap in -lfl... yes
checking lex output file root... lex.yy
checking whether yytext is a pointer... yes
checking for x86_64-pc-linux-gnu-ranlib... x86_64-pc-linux-gnu-ranlib
checking for gperf... notfound
configure: error: Couldn't find a usable gperf program.
Please install gperf which is available from
ftp://ftp.gnu.org/pub/gnu/gperf/


!!! Please attach the following file when seeking support:
!!! /var/tmp/portage/sci-electronics/gtkwave-3.1.6/work/gtkwave-3.1.6/config.log
 * 
 * ERROR: sci-electronics/gtkwave-3.1.6 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_compile
 *             environment, line  152:  Called econf
 *               ebuild.sh, line  513:  Called die
 * The specific snippet of code:
 *   			die "econf failed"
 *  The die message:
 *   econf failed
 * 
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/log/portage/sci-electronics:gtkwave-3.1.6:20080321-060722.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sci-electronics/gtkwave-3.1.6/temp/environment'.
 *