Someone

emerge -ptv squirrelmail

These are the packages that I would merge, in reverse order:

Calculating dependencies ...done!
[blocks B     ] dev-php/php (is blocking dev-php/PEAR-PEAR-1.3.6-r1)
[blocks B     ] dev-php/mod_php (is blocking dev-php/PEAR-PEAR-1.3.6-r1)
[blocks B     ] media-libs/libswf (is blocking dev-lang/php-5.0.5-r4)
[blocks B     ] dev-php/php (is blocking dev-lang/php-5.0.5-r4)
[blocks B     ] dev-php/mod_php (is blocking dev-lang/php-5.0.5-r4)
[ebuild  N    ] mail-client/squirrelmail-1.4.5-r1  +crypt -ldap +mysql -postgres -spell +ssl +vhosts -virus-scan 0 kB
[ebuild  N    ]  app-admin/webapp-config-1.11  0 kB
[ebuild  N    ] dev-php/PEAR-XML_RPC-1.4.4  0 kB
[ebuild  N    ] dev-php/PEAR-Console_Getopt-1.2-r1  0 kB
[ebuild  N    ] dev-php/PEAR-Archive_Tar-1.3.2  0 kB
[ebuild  N    ]  dev-php/PEAR-DB-1.7.6-r1  0 kB
[ebuild  N    ]   dev-php/PEAR-PEAR-1.3.6-r1  0 kB
[ebuild  N    ]   dev-lang/php-5.0.5-r4  -adabas -apache +apache2 -bcmath +berkdb -birdstep +bzip2 -calendar -cdb +cgi -cjk -cli +crypt +ctype +curl +curlwrappers -db2 -dba -dbase -dbmaker -debug +discard-path -doc -empress -empress-bcs -esoob +exif -fdftk -filepro -firebird -flatfile +force-cgi-redirect -frontbase -ftp +gd -gd-external -gdbm -gmp +hardenedphp -hyperwave-api -iconv -imap -informix -inifile -interbase -iodbc -ipv6 -java-external -kerberos -ldap -libedit -mcve -memlimit -mhash -ming -mnogosearch -msql -mssql +mysql -mysqli +ncurses +nls -oci8 (-oci8-instant-client) -odbc -oracle7 -ovrimos -pcntl +pcre -pdo-external -pear -pfpro +pic +posix -postgres -qdbm -readline -recode -sapdb -sasl +session +sharedext -sharedmem -simplexml -snmp -soap +sockets -solid -spell -spl -sqlite +ssl -sybase -sybase-ct +sysvipc -threads -tidy +tiff +tokenizer +truetype -wddx +xml2 -xmlrpc -xpm -xsl -yaz -zip +zlib 0 kB
[ebuild  N    ]    app-admin/eselect-php-0.96  0 kB
[ebuild  N    ]     app-admin/eselect-1.0_rc2  -bash-completion -doc 0 kB
[ebuild  N    ]  app-crypt/gnupg-1.4.2-r3  -X +bzip2 +caps +curl -ecc -idea -ldap +nls -readline (-selinux) -smartcard -static +usb +zlib 0 kB
[ebuild  N    ] dev-php/php-4.4.0-r4  -X +berkdb +crypt +curl -debug -doc -fdftk -firebird +flash -freetds +gd -gd-external -gdbm -gmp +hardenedphp -imap -informix -ipv6 +java +jpeg -kerberos -ldap -mcal -memlimit -mssql +mysql +ncurses +nls -oci8 -odbc +pam +png -postgres -readline -snmp -spell +ssl +tiff +truetype +xml2 -yaz 0 kB
[ebuild  N    ]  dev-php/mod_php-4.4.0-r9  -X +apache2 +berkdb +crypt +curl -debug -doc -fdftk -firebird +flash -freetds +gd -gd-external -gdbm -gmp +hardenedphp -imap -informix -ipv6 +java +jpeg -kerberos -ldap -mcal -memlimit -mssql +mysql +nls -oci8 -odbc +pam +png -postgres -snmp -spell +ssl +tiff +truetype +xml2 -yaz 0 kB
[ebuild  N    ]   media-libs/libswf-0.99  0 kB

Total size of downloads: 0 kB