This is a known bug and a patch is available at http://www.mail-archive.com/bug-m4@gnu.org/msg02167.html The patch works for me. Reproducible: Didn't try Steps to Reproduce: 1. emerge m4 Actual Results: x86_64-pc-linux-gnu-gcc -std=gnu99 -pipe -march=athlon64 -O2 -fomit-frame-pointer -ffast-math -Wl,-O1 -Wl,--sort-common -o m4 m4.o builtin.o debug.o eval.o format.o freeze.o input.o macro.o output.o path.o symtab.o stackovf.o ../lib/libm4.a ../lib/libm4.a(vasnprintf.o): In function `vasnprintf': vasnprintf.c:(.text+0x19b8): undefined reference to `decimal_point_char' vasnprintf.c:(.text+0x19eb): undefined reference to `decimal_point_char' vasnprintf.c:(.text+0x1a19): undefined reference to `decimal_point_char' vasnprintf.c:(.text+0x1a47): undefined reference to `decimal_point_char' collect2: ld returned 1 exit status make[1]: *** [m4] Error 1 make[1]: Leaving directory `/tmp/var/portage/sys-devel/m4-1.4.10/work/m4-1.4.10/src' make: *** [all-recursive] Error 1 Expected Results: Should build. ~ $ emerge --info Portage 2.1.3.7 (default-linux/amd64/2007.0/desktop, gcc-4.2.1, glibc-2.6.1-r0, 2.6.22-gentoo-r6-v1 x86_64) ================================================================= System uname: 2.6.22-gentoo-r6-v1 x86_64 AMD Athlon(tm) 64 Processor 3500+ Gentoo Base System release 1.12.10 Timestamp of tree: Sat, 01 Sep 2007 19:50:01 +0000 app-shells/bash: 3.2_p9-r1 dev-java/java-config: 1.3.7, 2.0.31-r3 dev-lang/python: 2.4.4 dev-python/pycrypto: 2.0.1-r5 sys-apps/baselayout: 1.12.10-r4 sys-apps/sandbox: 1.2.18.1 sys-devel/autoconf: 2.13, 2.61 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 sys-devel/binutils: 2.18 sys-devel/gcc-config: 1.4.0-r2 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.22-r2 ACCEPT_KEYWORDS="amd64 ~amd64" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-pipe -march=athlon64 -O2 -fomit-frame-pointer -ffast-math" 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/share/X11/xkb /usr/share/config" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/java-config/vms/ /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c" CXXFLAGS="-pipe -march=athlon64 -O2 -fomit-frame-pointer -ffast-math -fvisibility-inlines-hidden" DISTDIR="/var/cache/distfiles" FEATURES="distlocks metadata-transfer sandbox sfperms strict unmerge-orphans userfetch" GENTOO_MIRRORS=" http://mirrors.sec.informatik.tu-darmstadt.de/gentoo http://gentoo.mneisen.org http://gentoo.intergenia.de http://distro.ibiblio.org/pub/linux/distributions/gentoo " LANG="Clarence" LDFLAGS="-Wl,-O1 -Wl,--sort-common" MAKEOPTS="-j2" PKGDIR="/var/cache/packages" PORTAGE_RSYNC_EXTRA_OPTS="--exclude=ChangeLog --no-whole-file" 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="/var/lib/portage/gentoo" PORTDIR_OVERLAY="/var/lib/portage/local" SYNC="rsync://rsync.de.gentoo.org/gentoo-portage" USE="3dnow 3dnowext X acpi alsa amd64 arts artswrappersuid avi berkdb bitmap-fonts bzip2 cairo cdr cli cracklib crypt cups dbus dri dvd dvdr dvdread eds emboss encode esd evo fam fax fbcon firefox fortran gdbm gif gpm gs gstreamer gtk hal iconv imagemagick imap imlib ipv6 isdnlog javascript jpeg kde kdeenablefinal kdehiddenvisibility kerberos lm_sensors logitech-mouse mad midi mikmod mmx mmxext mozdevelop mozilla moznopango mozsvg mp3 mpeg mudflap ncurses network nls nptl nptlonly nvidia ogg opengl openmp oss pam pcre pdf perl png pppd python qt qt3 qt3support qt4 quicktime readline reflection rtc sdl session spl sse sse2 sse3 ssl svg tcpd tetex tiff truetype truetype-fonts type1-fonts unicode vorbis wmf xml xorg xv 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" ELIBC="glibc" INPUT_DEVICES="keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" USERLAND="GNU" VIDEO_CARDS="nvidia" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, LINGUAS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS
*** This bug has been marked as a duplicate of bug 185998 ***
