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checking whether to use glib... yes
checking for pkg-config... no
checking for GLIB - version >= 2.0.0... no
*** A new enough version of pkg-config was not found.
*** See http://www.freedesktop.org/software/pkgconfig/
checking for glib-config... no
checking for GLIB - version >= 1.2.0... no
*** The glib-config script installed by GLIB could not be found
*** If GLIB was installed in PREFIX, make sure PREFIX/bin is in
*** your path, or set the GLIB_CONFIG environment variable to the
*** full path to glib-config.
configure: WARNING: glib not found - using internal replacement
[snip]
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory
`/var/tmp/portage/app-emulation/libspectrum-0.2.2-r1/work/libspectrum-0.2.2'
make: *** [all-recursive-am] Error 2
 *
 * ERROR: app-emulation/libspectrum-0.2.2-r1 failed.

Portage 2.1.4_rc14 (default-linux/amd64/2007.0, gcc-4.2.2, glibc-2.7-r1,
2.6.23-gentoo-r1 x86_64)
=================================================================
System uname: 2.6.23-gentoo-r1 x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor
3800+
Timestamp of tree: Mon, 07 Jan 2008 19:00:08 +0000
app-shells/bash:     3.2_p33
dev-lang/python:     2.5.1-r5
sys-apps/baselayout: 1.12.10-r5
sys-apps/sandbox:    1.2.18.1-r2
sys-devel/autoconf:  2.61-r1
sys-devel/automake:  1.10
sys-devel/binutils:  2.18-r1
sys-devel/gcc-config: 1.4.0-r4
sys-devel/libtool:   1.5.24
virtual/os-headers:  2.6.23-r3
ACCEPT_KEYWORDS="amd64 ~amd64"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/kde/svn/env /usr/kde/svn/share/config
/usr/kde/svn/shutdown /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/fonts/fonts.conf /etc/gconf
/etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c /etc/udev/rules.d"
CXXFLAGS="-O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="buildpkg distlocks metadata-transfer sandbox sfperms strict
unmerge-orphans userfetch"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/linux/distributions/gentoo"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --delete-after --stats --timeout=180
--exclude=/distfiles --exclude=/local --exclude=/packages
--filter=H_**/files/digest-*"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://localhost/gentoo-portage"
USE="X acl amd64 berkdb bitmap-fonts cli cracklib crypt cups dri fortran gcj
gdbm gpm iconv ipv6 isdnlog midi mmx mudflap ncurses nls nptl nptlonly objc
openmp pam pcre perl pppd python readline reflection session spl sse sse2 ssl
tcpd truetype-fonts type1-fonts unicode xorg zlib" ALSA_CARDS="ali5451 als4000
atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968
fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx
via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop
empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi
null plug rate route share shm softvol" APACHE2_MODULES="actions alias
auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm
authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache
dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache
filter headers include info log_config logio mem_cache mime mime_magic
negotiation rewrite setenvif speling status unique_id userdir usertrack
vhost_alias" ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux"
LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses
text" USERLAND="GNU" VIDEO_CARDS="vga"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL,
LDFLAGS, LINGUAS, MAKEOPTS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS,
PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY

pkg-config is only used in the configure script to detect system's GLIB (will
not be detected if pkg-config isn't found).

Though GLIB is in fact optional for this package (because it has an internal
version with just the code it needs), we say in the ebuild it's a dependency (I
suppose, to avoid GLIB code redundancy), so we pass --with-glib at configure
time (unneeded, because it's already the default option).

The thing is, in this version, the internal GLIB code doesn't compile (it does
under 0.4.0, at least), as I'll show in a new transcript where you'll be able
to see where the error is.

So if you don't have dev-util/pkgconfig installed, then it won't be able to
find system's GLIB, and will try to use the internal version instead and
therefore it will fail.

I think we shouldn't use that redundant GLIB internal code anyway, so that code
doesn't need any modification. Then my proposed solution is to add a build time
dependency against dev-util/pkgconfig

This is the transcript that shows clearly where the problem is located:

[...]
*** A new enough version of pkg-config was not found.
*** See http://www.freedesktop.org/software/pkgconfig/
[...]
configure: WARNING: glib not found - using internal replacement
[...]
Making all in myglib
make[2]: se ingresa al directorio
`/var/tmp/portage/app-emulation/libspectrum-0.2.2-r1/work/libspectrum-0.2.2/myglib'
/bin/sh ../libtool --mode=compile x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I.
-I. -I..   -I/usr/include  -march=athlon64 -O2 -msse3 -fomit-frame-pointer
-finline-functions -Wall -c ghash.c
mkdir .libs
 x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I. -I.. -I/usr/include
-march=athlon64 -O2 -msse3 -fomit-frame-pointer -finline-functions -Wall -c
ghash.c  -fPIC -DPIC -o .libs/ghash.o
ghash.c:49: error: expected specifier-qualifier-list before 'gpointer'
ghash.c:57: error: expected specifier-qualifier-list before 'GHashFunc'
ghash.c:63: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*'
token
ghash.c: In function 'g_hash_nodes_destroy':
ghash.c:96: error: 'GHashNode' has no member named 'next'
[...]

Created an attachment (id=144398) [details]
Proposed solution (patch).

Proposed patch to add pkg-config dependency to the ebuild.

Many thanks Jose, in cvs.