Bugzilla Bug 231052

Having postfix-2.5.2 already installed and trying to enable USE=mailwrapper
leads to emerge first installing mailwrapper which will abort due to file
collisions with postfix: /usr/sbin/sendmail


# USE=mailwrapper emerge -av postfix

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  N    ] net-mail/mailwrapper-0.2.1  0 kB
[ebuild   R   ] mail-mta/postfix-2.5.2  USE="ipv6 mailwrapper* mysql pam ssl
-cdb -dovecot-sasl -hardened -ldap -mbox -nis -postgres -sasl (-selinux) -vda"
0 kB

Total: 2 packages (1 new, 1 reinstall), Size of downloads: 0 kB

Would you like to merge these packages? [Yes/No]
>>> Verifying ebuild Manifests...
>>> starting parallel fetching pid 10960

>>> Emerging (1 of 2) net-mail/mailwrapper-0.2.1 to /
 * mailwrapper-0.2.1.tbz2 RMD160 SHA1 SHA256 size ;-) ...                      
                    [ ok ]
>>> Creating Manifest for /usr/portage/net-mail/mailwrapper
 * checking ebuild checksums ;-) ...                                           
                    [ ok ]
 * checking auxfile checksums ;-) ...                                          
                    [ ok ]
 * checking miscfile checksums ;-) ...                                         
                    [ ok ]
 * checking mailwrapper-0.2.1.tbz2 ;-) ...                                     
                    [ ok ]
>>> Unpacking source...
>>> Unpacking mailwrapper-0.2.1.tbz2 to /var/tmp/portage/net-mail/mailwrapper-0.2.1/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/net-mail/mailwrapper-0.2.1/work/mailwrapper-0.2.1 ...
fgetln.c: In function 'fgetln':
fgetln.c:65: warning: incompatible implicit declaration of built-in function
'realloc'
fgetln.c:69: warning: incompatible implicit declaration of built-in function
'free'
>>> Source compiled.
>>> Test phase [not enabled]: net-mail/mailwrapper-0.2.1

>>> Install mailwrapper-0.2.1 into /var/tmp/portage/net-mail/mailwrapper-0.2.1/image/ category net-mail
>>> Completed installing mailwrapper-0.2.1 into /var/tmp/portage/net-mail/mailwrapper-0.2.1/image/

strip: i686-pc-linux-gnu-strip --strip-unneeded -R .comment
   usr/sbin/sendmail
ecompressdir: bzip2 -9 /usr/share/man

 * QA Notice: Package has poor programming practices which may compile
 *            fine but exhibit random runtime failures.
 * fgetln.c:65: warning: incompatible implicit declaration of built-in function
'realloc'
fgetln.c:69: warning: incompatible implicit declaration of built-in function
'free'

 * Please do not file a Gentoo bug and instead report the above QA
 * issues directly to the upstream developers of this software.
 * Homepage: http://www.gentoo.org/
* checking 5 files for package collisions
 * This package will overwrite one or more files that may belong to other
 * packages (see list below). You can use a command such as `portageq
 * owners / <filename>` to identify the installed package that owns a
 * file. If portageq reports that only one package owns a file then do
 * NOT file a bug report. A bug report is only useful if it identifies at
 * least two or more packages that are known to install the same file(s).
 * If a collision occurs and you can not explain where the file came from
 * then you should simply ignore the collision since there is not enough
 * information to determine if a real problem exists. Please do NOT file
 * a bug report at http://bugs.gentoo.org unless you report exactly which
 * two packages install the same file(s). Once again, please do NOT file
 * a bug report unless you have completely understood the above message.
 *
 * package net-mail/mailwrapper-0.2.1 NOT merged
 *
 * Detected file collision(s):
 *
 *      /usr/lib/debug/usr/sbin/sendmail.debug
 *      /usr/sbin/sendmail
 *
 * Searching all installed packages for file collisions...
 *
 * Press Ctrl-C to Stop
 *
 * mail-mta/postfix-2.5.2
 *      /usr/lib/debug/usr/sbin/sendmail.debug
 *      /usr/sbin/sendmail

# emerge --info
Portage 2.2_rc1 (default/linux/x86/2008.0/desktop, gcc-4.3.1,
glibc-2.8_p20080602-r0, 2.6.25-tuxonice-r6 i686)
=================================================================
System uname:
Linux-2.6.25-tuxonice-r6-i686-AMD_Athlon-tm-_XP_3000+-with-glibc2.0
Timestamp of tree: Mon, 07 Jul 2008 11:15:01 +0000
distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632)
[disabled]
ccache version 2.4 [enabled]
app-shells/bash:     3.2_p39
dev-java/java-config: 1.3.7, 2.1.6-r1
dev-lang/python:     2.5.2-r5
dev-python/pycrypto: 2.0.1-r6
dev-util/ccache:     2.4-r7
sys-apps/baselayout: 2.0.0
sys-apps/openrc:     9999
sys-apps/sandbox:    1.2.18.1-r3
sys-devel/autoconf:  2.13, 2.62-r1
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2,
1.10.1-r1
sys-devel/binutils:  2.18-r3
sys-devel/gcc-config: 1.4.0-r4
sys-devel/libtool:   2.2.4
virtual/os-headers:  2.6.25-r4
ACCEPT_KEYWORDS="x86 ~x86"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=pentium3 -mtune=athlon-xp -fomit-frame-pointer -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/share/config"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/
/etc/eselect/compiler /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release
/etc/php/apache2-php5/ext-active/ /etc/php/cgi-php5/ext-active/
/etc/php/cli-php5/ext-active/ /etc/revdep-rebuild /etc/splash /etc/terminfo
/etc/texmf/web2c /etc/udev/rules.d"
CXXFLAGS="-O2 -march=pentium3 -mtune=athlon-xp -fomit-frame-pointer -pipe"
DISTDIR="/usr/my-distfiles"
FEATURES="ccache collision-protect cvs digest distlocks multilib-strict
parallel-fetch preserve-libs sandbox sfperms sign splitdebug strict
unmerge-orphans userfetch userpriv usersandbox"
GENTOO_MIRRORS="http://gentoo.mneisen.org/"
LANG="de_DE.utf8"
LC_ALL="C"
LDFLAGS="-Wl,-O1,--as-needed"
LINGUAS="de en en_GB"
PKGDIR="/usr/my-packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --stats --timeout=180 --exclude=/distfiles
--exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/overlays/zzam /usr/local/overlays/vdr/experimental
/usr/local/overlays/vdr/vdr-devel /usr/local/overlays/vdr/testing
/usr/local/overlays/layman/sunrise /usr/local/overlays/gentoo.de
/usr/local/overlays/dev-overlay"
SYNC="cvs://zzam@cvs.gentoo.org:/var/cvsroot"
USE="3dnow 3dnowext X Xaw3d a52 aac acl acpi alsa amr apache2 artswrappersuid
audacious berkdb bluetooth branding bzip2 cairo cap caps cdaudio cddb
cdparanoia cdr cli cracklib crypt cups curl dbus doc dri dts dvb dvd dvdr
dvdread emboss encode evo exif fam fbcon ffmpeg firefox font-server fortran
fuse gcj gdbm gif gimpprint glut gnutls gphoto2 gpm graphviz gstreamer gtk gtk2
hal hbci iconv imap ipv6 isdnlog java jpeg jpeg2k kde kdexdeltas kerberos
libdvdread libnotify lirc logitech-mouse mad midi mikmod mjpeg mmx mmxext mng
mp3 mpeg mplayer mudflap musicbrainz mysql ncurses nls nptl nptlonly nsplugin
nvram offensive ogg opengl openmp pam pcre pdf perl php png ppds pppd projectx
python qt3 qt3support qt4 quotes readline reflection regex samba session sms
sndfile spell spl sql sqlite sse ssl startup-notification svg taglib tcltk tcpd
theora threads tiff truetype unicode usb userlocales v4l v4l2 vcd vdr
visualization vorbis webdav win32codecs wma wmf x264 x86 xcomposite xext
xinerama xml xorg xrandr xslt xulrunner xv xvid zlib zvbi" ALSA_CARDS="emu10k1
intel8x0" 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" CAMERAS="ptp2" DVB_CARDS="ttpci usb-wt220u dibusb-usb2
usb-dib0700" ELIBC="glibc" INPUT_DEVICES="mouse keyboard" KERNEL="linux"
LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses
text xosd" LINGUAS="de en en_GB" LIRC_DEVICES="all" USERLAND="GNU"
VIDEO_CARDS="nvidia v4l vesa vbdev nv"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, MAKEOPTS,
PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

Added a blocker on net-mail/mailwrapper if mailwrapper use-flag isn't used.