Compiling 4.3.0 with mySQL 3.22 installed. Configures fine, compiles all the way up until:

/bin/sh libtool --silent --mode=link gcc -export-dynamic -g -O2  -rdynamic   ext/zlib/zlib.lo ext/zlib/zlib_fopen_wrapper.lo ext/ctype/ctype.lo ext/dba/dba.lo ext/dba/dba_cdb.lo ext/dba/dba_db2.lo ext/dba/dba_dbm.lo ext/dba/dba_gdbm.lo ext/dba/dba_ndbm.lo ext/dba/dba_db3.lo ext/imap/php_imap.lo ext/ldap/ldap.lo ext/mysql/php_mysql.lo ext/openssl/openssl.lo ext/overload/overload.lo ext/pcre/pcrelib/maketables.lo ext/pcre/pcrelib/get.lo ext/pcre/pcrelib/study.lo ext/pcre/pcrelib/pcre.lo ext/pcre/php_pcre.lo ext/pgsql/pgsql.lo ext/posix/posix.lo ext/session/session.lo ext/session/mod_files.lo ext/session/mod_mm.lo ext/session/mod_user.lo ext/standard/array.lo ext/standard/base64.lo ext/standard/basic_functions.lo ext/standard/browscap.lo ext/standard/crc32.lo ext/standard/crypt.lo ext/standard/cyr_convert.lo ext/standard/datetime.lo ext/standard/dir.lo ext/standard/dl.lo ext/standard/dns.lo ext/standard/exec.lo ext/standard/file.lo ext/standard/filestat.lo ext/standard/flock_compat.lo ext/standard/formatted_print.lo ext/standard/fsock.lo ext/standard/head.lo ext/standard/html.lo ext/standard/image.lo ext/standard/info.lo ext/standard/iptc.lo ext/standard/lcg.lo ext/standard/link.lo ext/standard/mail.lo ext/standard/math.lo ext/standard/md5.lo ext/standard/metaphone.lo ext/standard/microtime.lo ext/standard/pack.lo ext/standard/pageinfo.lo ext/standard/parsedate.lo ext/standard/quot_print.lo ext/standard/rand.lo ext/standard/reg.lo ext/standard/soundex.lo ext/standard/string.lo ext/standard/scanf.lo ext/standard/syslog.lo ext/standard/type.lo ext/standard/uniqid.lo ext/standard/url.lo ext/standard/url_scanner.lo ext/standard/var.lo ext/standard/versioning.lo ext/standard/assert.lo ext/standard/strnatcmp.lo ext/standard/levenshtein.lo ext/standard/incomplete_class.lo ext/standard/url_scanner_ex.lo ext/standard/ftp_fopen_wrapper.lo ext/standard/http_fopen_wrapper.lo ext/standard/php_fopen_wrapper.lo ext/standard/credits.lo ext/standard/css.lo ext/standard/var_unserializer.lo ext/standard/ftok.lo ext/standard/aggregation.lo ext/standard/sha1.lo ext/sysvsem/sysvsem.lo ext/sysvshm/sysvshm.lo ext/tokenizer/tokenizer.lo ext/xml/xml.lo ext/xml/expat/xmlparse.lo ext/xml/expat/xmlrole.lo ext/xml/expat/xmltok.lo regex/regcomp.lo regex/regexec.lo regex/regerror.lo regex/regfree.lo TSRM/TSRM.lo TSRM/tsrm_strtok_r.lo TSRM/tsrm_virtual_cwd.lo main/main.lo main/snprintf.lo main/spprintf.lo main/php_sprintf.lo main/safe_mode.lo main/fopen_wrappers.lo main/alloca.lo main/php_ini.lo main/SAPI.lo main/rfc1867.lo main/php_content_types.lo main/strlcpy.lo main/strlcat.lo main/mergesort.lo main/reentrancy.lo main/php_variables.lo main/php_ticks.lo main/streams.lo main/network.lo main/php_open_temporary_file.lo main/php_logos.lo main/output.lo main/memory_streams.lo main/user_streams.lo Zend/zend_language_parser.lo Zend/zend_language_scanner.lo Zend/zend_ini_parser.lo Zend/zend_ini_scanner.lo Zend/zend_alloc.lo Zend/zend_compile.lo Zend/zend_constants.lo Zend/zend_dynamic_array.lo Zend/zend_execute_API.lo Zend/zend_highlight.lo Zend/zend_llist.lo Zend/zend_opcode.lo Zend/zend_operators.lo Zend/zend_ptr_stack.lo Zend/zend_stack.lo Zend/zend_variables.lo Zend/zend.lo Zend/zend_API.lo Zend/zend_extensions.lo Zend/zend_hash.lo Zend/zend_list.lo Zend/zend_indent.lo Zend/zend_builtin_functions.lo Zend/zend_sprintf.lo Zend/zend_ini.lo Zend/zend_qsort.lo Zend/zend_multibyte.lo Zend/zend_execute.lo sapi/cli/php_cli.lo sapi/cli/getopt.lo main/internal_functions_cli.lo -lcrypto -lssl -lc-client -lmm -lpq -lmysqlclient -lldap -llber -lcrypt -lpam -ldb -lz -lcrypt -lssl -lcrypto -lresolv -lm -ldl -lnsl -lcrypt  -o sapi/cli/php
libtool: link: warning: library `/usr/lib/libmm.la' was moved.
libtool: link: warning: library `/usr/lib/libmm.la' was moved.
ext/mysql/php_mysql.o: In function `zif_mysql_client_encoding':
/muds/websrc/php-4.3.0/ext/mysql/php_mysql.c:1077: undefined reference to `mysql_character_set_name'
ext/mysql/php_mysql.o: In function `zif_mysql_real_escape_string':
/muds/websrc/php-4.3.0/ext/mysql/php_mysql.c:1671: undefined reference to `mysql_real_escape_string'
collect2: ld returned 1 exit status
make: *** [sapi/cli/php] Error 1

I tried using the built in mySQL library, but PHP pages ended up causing apache to segfault. I had to backrev to my previous version (4.2.1).

Upgrading mySQL is a bit of a pain, so I don't really want to do that if there isn't a good reason to... it's a lot of downtime with all the different databases I have.

--Nathan