this problem is very similar to... 
http://bugs.php.net/bug.php?id=21466

only based on my compile options, it has nothing to do with pdf (i'm not installing it). i personally think it is sablot that changes something that then causes zip to crap out. take a look and see if it is php related.

versions...
redhat 8.0 full install (all libraries)
php-4.3.1
apache_1.3.27
expat-1.95.5 (expat-1.95.6 doesn't work with Sablot yet)
sablot-0.97
zziplib-0.10.75 (same error when used with 0.11.15 or 0.10.27)
kernel-smp-2.4.18-24.8.0

the problem config...
./configure --with-apache=../apache_1.3.27 --enable-xslt --with-xslt-sablot --with-zip

both these configs work fine...
./configure --with-apache=../apache_1.3.27 --enable-xslt --with-xslt-sablot

./configure --with-apache=../apache_1.3.27 --with-zip


the probelm config causes config.log excerpt below

configure:71260: checking whether to enable XML support
configure:71306: checking external libexpat install dir
configure:71951: checking for XMLRPC-EPI support
configure:71997: checking libexpat dir for XMLRPC-EPI
configure:72022: checking iconv dir for XMLRPC-EPI
configure:73484: checking whether to enable xslt support
configure:73530: checking for XSLT Sablotron backend
configure:73555: checking for libexpat dir for Sablotron XSL support
configure:73580: checking for iconv dir for Sablotron XSL support
configure:73605: checking for JavaScript for Sablotron XSL support
configure:73859: checking for Sablotron libraries in the default path
configure:73875: checking for sablot-config
configure:73893: checking for Sablotron version
configure:73918: gcc -o conftest -g -O2  -I/usr/local/include  conftest.c -lcrypt -lresolv -lm -ldl -lnsl  -lcrypt 1>&5
cc1: warning: changing search order for system directory "/usr/local/include"
cc1: warning:   as it has already been specified as a non-system directory
configure:74093: checking for iconv
configure:74121: gcc -o conftest -g -O2   -Wl,-rpath,/usr/local/lib -L/usr/local/lib conftest.c -lexpat -lcrypt -lresolv -lm -ldl -lnsl  -lcrypt 1>&5
configure:74652: checking for SablotSetEncoding in -lsablot
configure:74671: gcc -o conftest -g -O2
      -L/usr/local/lib
      -Wl,-rpath,/usr/local/lib -L/usr/local/lib conftest.c -lsablot  -lexpat -lcrypt -lresolv -lm -ldl -lnsl  -lcrypt 1>&5
/usr/local/lib/libsablot.so: undefined reference to `operator new[](unsigned)'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator delete(void*)'
/usr/local/lib/libsablot.so: undefined reference to `__gxx_personality_v0'
/usr/local/lib/libsablot.so: undefined reference to `__cxa_pure_virtual'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator delete[](void*)'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__vmi_class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator new(unsigned)'
collect2: ld returned 1 exit status
configure: failed program was:
#line 74660 "configure"
#include "confdefs.h"
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char SablotSetEncoding();

int main() {
SablotSetEncoding()
; return 0; }
configure:74705: checking for SablotGetOptions in -lsablot
configure:74724: gcc -o conftest -g -O2   -Wl,-rpath,/usr/local/lib -L/usr/local/lib conftest.c -lsablot  -lexpat -lcrypt -lresolv -lm -ldl -lnsl  -lcrypt 1>&5
/usr/local/lib/libsablot.so: undefined reference to `operator new[](unsigned)'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator delete(void*)'
/usr/local/lib/libsablot.so: undefined reference to `__gxx_personality_v0'
/usr/local/lib/libsablot.so: undefined reference to `__cxa_pure_virtual'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator delete[](void*)'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__vmi_class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator new(unsigned)'
collect2: ld returned 1 exit status
configure: failed program was:
#line 74713 "configure"
#include "confdefs.h"
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char SablotGetOptions();

int main() {
SablotGetOptions()
; return 0; }
configure:74894: checking for YAZ support
configure:75407: checking whether to include YP support
configure:75875: checking for ZIP support
configure:75941: checking for zzip_open in -lzzip
configure:75960: gcc -o conftest -g -O2
    -L/usr/local/lib
    -Wl,-rpath,/usr/local/lib -L/usr/local/lib conftest.c -lzzip  -lsablot -lexpat -lcrypt -lresolv -lm -ldl -lnsl  -lcrypt 1>&5
/usr/local/lib/libsablot.so: undefined reference to `operator new[](unsigned)'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator delete(void*)'
/usr/local/lib/libsablot.so: undefined reference to `__gxx_personality_v0'
/usr/local/lib/libsablot.so: undefined reference to `__cxa_pure_virtual'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator delete[](void*)'
/usr/local/lib/libsablot.so: undefined reference to `vtable for __cxxabiv1::__vmi_class_type_info'
/usr/local/lib/libsablot.so: undefined reference to `operator new(unsigned)'
collect2: ld returned 1 exit status
configure: failed program was:
#line 75949 "configure"
#include "confdefs.h"
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char zzip_open();

int main() {
zzip_open()
; return 0; }