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I bet there is a missing -lm in LDFLAGS somewhere there.

/bin/sh ./libtool --tag=CC --mode=link i386-gentoo-linux-uclibc-gcc  -DINET6
-D_U_="__attribute__((unused))" -march=i386 -O3 -pipe -fomit-frame-pointer
-fno-stack-protector -Wall -W -Wdeclaration-after-statement -Wendif-labels
-Wpointer-arith -I/usr/local/include -I/usr/include/glib-1.2
-I/usr/lib/glib/include -DNETSNMP_ENABLE_IPV6 -march=i386 -pipe -O2 -Ulinux
-Dlinux=linux -I. -I/usr/include  -L/usr/local/lib -o capinfos  capinfos.o
plugins.o report_err.o privileges.o filesystem.o wiretap/libwiretap.la
-L/usr/lib -rdynamic -lgmodule -lglib -lz 
i386-gentoo-linux-uclibc-gcc -DINET6 "-D_U_=__attribute__((unused))"
-march=i386 -O3 -pipe -fomit-frame-pointer -fno-stack-protector -Wall -W
-Wdeclaration-after-statement -Wendif-labels -Wpointer-arith
-I/usr/local/include -I/usr/include/glib-1.2 -I/usr/lib/glib/include
-DNETSNMP_ENABLE_IPV6 -march=i386 -pipe -O2 -Ulinux -Dlinux=linux -I.
-I/usr/include -o .libs/mergecap mergecap.o merge.o -rdynamic  -L/usr/local/lib
wiretap/.libs/libwiretap.so -L/usr/lib /usr/lib/libgmodule.so
/usr/lib/libglib.so -lz
wiretap/.libs/libwiretap.so: undefined reference to `modf'
collect2: ld returned 1 exit status
make[2]: *** [mergecap] Error 1
make[2]: *** Waiting for unfinished jobs....
i386-gentoo-linux-uclibc-gcc -DINET6 "-D_U_=__attribute__((unused))"
-march=i386 -O3 -pipe -fomit-frame-pointer -fno-stack-protector -Wall -W
-Wdeclaration-after-statement -Wendif-labels -Wpointer-arith
-I/usr/local/include -I/usr/include/glib-1.2 -I/usr/lib/glib/include
-DNETSNMP_ENABLE_IPV6 -march=i386 -pipe -O2 -Ulinux -Dlinux=linux -I.
-I/usr/include -o .libs/capinfos capinfos.o plugins.o report_err.o privileges.o
filesystem.o -rdynamic  -L/usr/local/lib wiretap/.libs/libwiretap.so -L/usr/lib
/usr/lib/libgmodule.so /usr/lib/libglib.so -lz
rm -f .libs/tshark.nm .libs/tshark.nmS .libs/tshark.nmT
creating .libs/tsharkS.c
(cd .libs && i386-gentoo-linux-uclibc-gcc  -march=i386 -O3 -pipe
-fomit-frame-pointer -fno-stack-protector -c -fno-builtin "tsharkS.c")
wiretap/.libs/libwiretap.so: undefined reference to `modf'
collect2: ld returned 1 exit status
make[2]: *** [capinfos] Error 1

emerge --info please.

Portage 2.1.2.9 (uclibc/x86/hardened, gcc-3.4.6, uclibc-0.9.28.3-r0,
2.6.22-gentoo-r1 i686)
=================================================================
System uname: 2.6.22-gentoo-r1 i686 Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz
Gentoo Base System release 2.0.0_alpha4
Timestamp of tree: Sat, 21 Jul 2007 23:00:02 +0000
dev-lang/python:     2.4.4-r4
dev-python/pycrypto: 2.0.1-r5
sys-apps/sandbox:    1.2.17
sys-devel/autoconf:  2.61
sys-devel/automake:  1.6.3, 1.9.6-r2, 1.10
sys-devel/binutils:  2.17
sys-devel/gcc-config: 1.3.16
sys-devel/libtool:   1.5.23b
virtual/os-headers:  2.6.21
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i386-gentoo-linux-uclibc"
CFLAGS="-march=i386 -Os -pipe -fomit-frame-pointer"
CHOST="i386-gentoo-linux-uclibc"
CONFIG_PROTECT="/etc"
CONFIG_PROTECT_MASK="/etc/env.d /etc/gconf /etc/terminfo"
CXXFLAGS="-Os -pipe"
DISTDIR="/var/cache/distfiles"
FEATURES="autoconfig buildpkg distlocks metadata-transfer nodoc noinfo noman
sandbox sfperms strict"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/linux/distributions/gentoo"
MAKEOPTS="-j3"
PKGDIR="/var/cache/packages/default"
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"
PORTDIR_OVERLAY="/usr/alpine-portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X509 bitmap-fonts bri bzip2 cli cracklib dri encode expat extensions
hardened iproute2 ipv6 jpeg lua mad midi mudflap ncurses netboot nonfsv4 ntfs
ogg openmp oss pci pcmcia pic png pppd pri readline reflection rrdtool sensord
session snmp speex spl ssl tdb truetype truetype-fonts type1-fonts uclibc
uclibc++ udev usb userlocales wifi wordexp x86 xorg zaptel zlib"
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="uclibc" INPUT_DEVICES="keyboard mouse evdev"
KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001
mtxorb ncurses text" MISDN_CARDS="avmfritz hfcmulti hfcpci hfcsmini hfcsusb
netjetpci sedlfax w6692pci xhfc" USERLAND="GNU" VIDEO_CARDS="dummy fbdev v4l
apm ark chips cirrus cyrix epson glint i128 i740 i810 imstt mach64 mga neomagic
nsc nv r128 radeon rendition s3 s3virge savage siliconmotion sis sisusb tdfx
tga trident tseng vesa vga via voodoo"
Unset:  CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, LDFLAGS,
LINGUAS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

Please, attach config.log and wiretap/config.log.

Created an attachment (id=125839) [details]
wireshark-0.99.6-ldflag-lm.patch

You will get the config.log and wiretap/config.log in a second. (I blowed away
my /var/tmp/..../wireshark dir so i need to recompile)

Created an attachment (id=125841) [details]
config.log

as requested

Created an attachment (id=125842) [details]
wiretap/config.log

After applying the previously attatched wireshark-0.99.6-ldflag-lm.patch the
linking works. "Forgetting" -lm is a common mistake since glibc works without
it. Other libc's are not as forgiving.

Created an attachment (id=125849) [details]
wireshark-0.99.6-lm.patch

Eh. Your clarification helped me to recall the problem.

But why do you fix compilation of the programs which compiles with
libwireshark, while the problem is in libwireshark? Does this ^^ patch works
for you?

Thank you for report, BTW :)

Also, may be the correct solution will be use @LIBM@ and add AC_CHECK_LIBM into
wiretap/configure.in which is part of libtool distribution (libtool.m4).

(In reply to comment #9)
> Also, may be the correct solution will be use @LIBM@ and add AC_CHECK_LIBM into
> wiretap/configure.in which is part of libtool distribution (libtool.m4).
> 

Sounds like the proper way to handle this.
Should be reported upstream too.

btw. The patch you posted works too. (my patch was shooting at anything that
was moving...)

wireshark-0.99.6-r1 is commited with the fixes for this problem too.  Please,
report if I did anything wrong, as I do not have system with ulibc to test the
fix.

Again, thank you for report... fixed. :)