Bugzilla Bug 16715

emerge doomlegacy-1.40 fails at link stage due to undefined reference to
`errno`.

I can fix it by including <errno.h> in linux_x/i_sound.c. Here's a patch:

--- linux_x/i_sound.c.orig      2003-03-02 23:48:57.000000000 -0500
+++ linux_x/i_sound.c   2003-03-02 23:49:51.000000000 -0500
@@ -84,6 +84,8 @@
 #include <sys/time.h>
 #include <sys/types.h>

+#include <errno.h>
+
 #if !defined(LINUX) && !defined(SCOOS5) && !defined(_AIX)
 #include <sys/filio.h>
 #endif
@@ -261,7 +263,7 @@
   int*  arg )
 {
     int         rc;
-    extern int  errno;
+//    extern int  errno;

     rc = ioctl(fd, command, arg);
     if (rc < 0)


Reproducible: Always
Steps to Reproduce:
1.emerge doomlegacy
2.
3.

Actual Results:  
undefined reference to `errno' in objs/i_sound.o


Portage 2.0.47-r7 (default-x86-1.4, gcc-3.2.2, glibc-2.3.2_pre1-r0)
=================================================================
System uname: 2.4.20-gentoo-r1 i686 AMD Athlon(tm) Processor
GENTOO_MIRRORS=" ftp://ftp.gtlib.cc.gatech.edu/pub/gentoo
ftp://csociety-ftp.ecn.purdue.edu/pub/gentoo/
http://194.83.57.11/sites/www.ibiblio.org/gentoo/"
CONFIG_PROTECT="/etc /var/qmail/control /usr/share/config
/usr/kde/2/share/config /usr/kde/3/share/config /usr/X11R6/lib/X11/xkb"
CONFIG_PROTECT_MASK="/etc/gconf /etc/env.d"
PORTDIR="/usr/portage"
DISTDIR="/usr/portage/distfiles"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR_OVERLAY=""
USE="oss perl esd -arts -avi -berkdb -crypt -cups -encode -imlib -kde -libg++
-libwww -mikmod -motif -nls -oggvorbis -pam -python -qt -qtmt -sdl -slang -ssl
-svga -tcpd -xmms x86 3dnow apm bonobo gdbm gif gnome gpm gtk java jpeg maildir
mmx mozilla mpeg ncurses opengl pdflib pic png quicktime readline spell tcltk
tetex truetype X xml2 xv zlib"
COMPILER="gcc3"
CHOST="i686-pc-linux-gnu"
CFLAGS="-march=athlon-tbird -O3 -fomit-frame-pointer -pipe"
CXXFLAGS="-march=athlon-tbird -O3 -fomit-frame-pointer -pipe"
ACCEPT_KEYWORDS="x86 ~x86"
MAKEOPTS="-j2"
AUTOCLEAN="yes"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
FEATURES="sandbox ccache userpriv usersandbox"

I can also confirm this bug

thats not the only file with 'extern int errno' ;)
anyways, i tweaked the ebuild/source/makefile and added changes to cvs ...

http://cvs.gentoo.org/cgi-bin/viewcvs.cgi/gentoo-x86/app-games/doomlegacy/doomlegacy-1.40-r1.ebuild?rev=1.1&content-type=text/vnd.viewcvs-markup
http://cvs.gentoo.org/cgi-bin/viewcvs.cgi/gentoo-x86/app-games/doomlegacy/files/1.40-errno.patch?rev=1.1&content-type=text/vnd.viewcvs-markup
http://cvs.gentoo.org/cgi-bin/viewcvs.cgi/gentoo-x86/app-games/doomlegacy/files/makefile.patch.diff?r1=1.1&r2=1.2