You should enable -g (or higher) for debugging!
 * CPV:  games-strategy/freeciv-2.2.0
 * REPO: gentoo
 * USE:  auth dedicated elibc_glibc ggz ipv6 kernel_linux sdl sound test userland_GNU x86
>>> Unpacking source...
>>> Unpacking freeciv-2.2.0.tar.bz2 to /var/tmp/portage/games-strategy/freeciv-2.2.0/work
>>> Source unpacked in /var/tmp/portage/games-strategy/freeciv-2.2.0/work
>>> Preparing source in /var/tmp/portage/games-strategy/freeciv-2.2.0/work/freeciv-2.2.0 ...
 * Applying freeciv-2.2.0-clean-man.patch ...
  [ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/games-strategy/freeciv-2.2.0/work/freeciv-2.2.0 ...
 * econf: updating freeciv-2.2.0/bootstrap/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating freeciv-2.2.0/bootstrap/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --prefix=/usr/games --libdir=/usr/games/lib --datadir=/usr/share/games --sysconfdir=/etc/games --localstatedir=/var/games --disable-dependency-tracking --localedir=/usr/share/locale --enable-auth --enable-ipv6 --disable-nls --without-readline --enable-sdl-mixer --with-ggz-client --enable-client=no
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for i686-pc-linux-gnu-gcc... i686-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 i686-pc-linux-gnu-gcc accepts -g... yes
checking for i686-pc-linux-gnu-gcc option to accept ISO C89... none needed
checking how to run the C preprocessor... i686-pc-linux-gnu-gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking minix/config.h usability... no
checking minix/config.h presence... no
checking for minix/config.h... no
checking whether it is safe to define __EXTENSIONS__... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for style of include used by make... GNU
checking dependency style of i686-pc-linux-gnu-gcc... none
checking mysql/mysql.h usability... no
checking mysql/mysql.h presence... no
checking for mysql/mysql.h... no
configure: WARNING: couldn't find mysql header: disabling auth
checking for mysql_query in -lmysqlclient... no
configure: WARNING: couldn't find mysql libs in normal locations
checking for mysql_query in -lmysqlclient... no
configure: WARNING: couldn't find mysql libs in -L/usr/lib/mysql
checking for mysql_query in -lmysqlclient... no
configure: WARNING: couldn't find mysql libs in -L/usr/local/lib/mysql
configure: error: couldn't find mysql libs at all

!!! Please attach the following file when seeking support:
!!! /var/tmp/portage/games-strategy/freeciv-2.2.0/work/freeciv-2.2.0/config.log
 * ERROR: games-strategy/freeciv-2.2.0 failed:
 *   econf failed
 * 
 * Call stack:
 *     ebuild.sh, line   54:  Called src_configure
 *   environment, line 2757:  Called egamesconf '--disable-dependency-tracking' '--localedir=/usr/share/locale' '--enable-auth' '--enable-ipv6' '--disable-nls' '--without-readline' '--enable-sdl-mixer' '--with-ggz-client' '--enable-client=no'
 *   environment, line  810:  Called econf '--prefix=/usr/games' '--libdir=/usr/games/lib' '--datadir=/usr/share/games' '--sysconfdir=/etc/games' '--localstatedir=/var/games' '--disable-dependency-tracking' '--localedir=/usr/share/locale' '--enable-auth' '--enable-ipv6' '--disable-nls' '--without-readline' '--enable-sdl-mixer' '--with-ggz-client' '--enable-client=no'
 *     ebuild.sh, line  544:  Called die
 * The specific snippet of code:
 *   			die "econf failed"
 * 
 * If you need support, post the output of 'emerge --info =games-strategy/freeciv-2.2.0',
 * the complete build log and the output of 'emerge -pqv =games-strategy/freeciv-2.2.0'.
 * The complete build log is located at '/var/tmp/portage/games-strategy/freeciv-2.2.0/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/games-strategy/freeciv-2.2.0/temp/environment'.
 * S: '/var/tmp/portage/games-strategy/freeciv-2.2.0/work/freeciv-2.2.0'