When installing PHP 4.3 on my system running GCC 3.2.1, I get the following output. This is obviously incorrect.

If you need any further info, please ask. 

arsenic root # emerge php
Calculating dependencies ...done!
>>> emerge (1 of 1) dev-php/php-4.3.0-r2 to /
>>> md5 ;-) php-4.3.0.tar.bz2
>>> Unpacking source...
>>> Unpacking php-4.3.0.tar.bz2
>>> Source unpacked.
ssl
gdbm
mysql
truetype
jpeg
Compiling imap with SSL support
libwww
flash
xml2
crypt
creating cache ./config.cache
checking for Cygwin environment... no
checking for mingw32 environment... no
checking for working sed... sed
checking host system type... i686-pc-linux-gnu
Updated php_version.h
checking for gcc... gcc
checking whether the C compiler (gcc -march=i686 -O3 -pipe ) works... yes
checking whether the C compiler (gcc -march=i686 -O3 -pipe ) is a cross-compiler... yes
checking whether we are using GNU C... yes
checking whether gcc accepts -g... yes
checking whether gcc and cc understand -c and -o together... yes
checking how to run the C preprocessor... gcc -E
checking for AIX... no
checking if compiler supports -R... no
checking if compiler supports -Wl,-rpath,... yes
checking for ranlib... ranlib
checking whether ln -s works... yes
checking for gawk... gawk
checking for bison... bison -y
checking bison version... 1.35 (ok)
checking for flex... flex
checking for yywrap in -lfl... yes
checking lex output file root... lex.yy
checking whether yytext is a pointer... yes
checking for working const... yes
checking flex version... 2.5.4 (ok)
checking for pthreads_cflags...
checking for pthreads_lib...

Configuring SAPI modules
checking for AOLserver support... no
checking for Apache 1.x module support via DSO through APXS... no
checking for Apache 1.x module support... no
checking for mod_charset compatibility option... no
checking for Apache 2.0 module support via DSO through APXS... no
checking for Caudium support... no
checking for CLI build... yes
checking for embedded SAPI library support... no
checking for Zeus ISAPI support... no
checking for NSAPI support... no
checking for PHTTPD support... no
checking for Pi3Web support... no
checking for Roxen/Pike support... no
checking for Servlet support... no
checking for thttpd... no
checking for TUX... no
checking for webjames... no
checking for CGI build... no
checking for chosen SAPI module... cli

Running system checks
checking for missing declarations of reentrant functions... done
checking for sendmail... /usr/sbin/sendmail
checking whether system uses EBCDIC... no
checking for socket... yes
checking for htonl... yes
checking for gethostname... yes
checking for gethostbyaddr... yes
checking for yp_get_default_domain... no
checking for __yp_get_default_domain... no
checking for yp_get_default_domain in -lnsl... yes
checking for dlopen... yes
checking for sin in -lm... yes
checking for res_search... no
checking for __res_search... no
checking for res_search in -lresolv... yes
checking for res_search in -lbind... no
checking for __res_search in -lbind... no
checking for res_search in -lsocket... no
checking for __res_search in -lsocket... no
checking for inet_aton... yes
checking for dn_skipname... no
checking for __dn_skipname... no
checking for dn_skipname in -lresolv... no
checking for __dn_skipname in -lresolv... yes
checking for dn_skipname in -lbind... no
checking for __dn_skipname in -lbind... no
checking for ANSI C header files... yes
checking for dirent.h that defines DIR... yes
checking for opendir in -ldir... no
checking for fclose declaration... ok
checking for ApplicationServices/ApplicationServices.h... no
checking for sys/types.h... yes
checking for sys/time.h... yes
checking for netinet/in.h... yes
checking for alloca.h... yes
checking for arpa/inet.h... yes
checking for arpa/nameser.h... yes
checking for assert.h... yes
checking for crypt.h... yes
checking for fcntl.h... yes
checking for grp.h... yes
checking for ieeefp.h... no
checking for langinfo.h... yes
checking for limits.h... yes
checking for locale.h... yes
checking for monetary.h... yes
checking for mach-o/dyld.h... no
checking for netdb.h... yes
checking for pwd.h... yes
checking for resolv.h... yes
checking for signal.h... yes
checking for stdarg.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for syslog.h... yes
checking for sysexits.h... yes
checking for sys/file.h... yes
checking for sys/mman.h... yes
checking for sys/mount.h... yes
checking for sys/poll.h... yes
checking for sys/resource.h... yes
checking for sys/select.h... yes
checking for sys/socket.h... yes
checking for sys/statfs.h... yes
checking for sys/statvfs.h... yes
checking for sys/vfs.h... yes
checking for sys/sysexits.h... no
checking for sys/varargs.h... no
checking for sys/wait.h... yes
checking for unistd.h... yes
checking for unix.h... no
checking for utime.h... yes
checking for sys/utsname.h... yes
checking for sys/ipc.h... yes
checking for fopencookie... yes
configure: error: can not run test program while cross compiling

!!! ERROR: dev-php/php-4.3.0-r2 failed.
!!! Function src_compile, Line 137, Exitcode 1
!!! bad ./configure