[PHP-INSTALL] Problem with imap...

[Leif K-Brooks]

I'm trying to configure with this:

'./configure' 'i386-redhat-linux' '--prefix=/usr' '--exec-prefix=/usr' 
'--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' 
'--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib' 
'--libexecdir=/usr/libexec' '--localstatedir=/var' 
'--sharedstatedir=/usr/com' '--mandir=/usr/share/man' 
'--infodir=/usr/share/info' '--prefix=/usr' 
'--with-config-file-path=/etc' '--enable-force-cgi-redirect' 
'--disable-debug' '--enable-pic' '--disable-rpath' 
'--enable-inline-optimization' '--with-bz2' '--with-db3' 
'--with-exec-dir=/usr/bin' '--with-gd' '--enable-gd-native-ttf' 
'--with-ttf' '--with-gdbm' '--with-gettext=shared' '--with-ncurses' 
'--with-gmp' '--with-iconv' '--with-jpeg-dir=/usr' '--with-mm' 
'--with-openssl' '--with-pear' '--with-png' '--with-pspell' 
'--with-regex=system' '--with-xml' '--with-expat-dir=/usr' '--with-zlib' 
'--with-layout=GNU' '--enable-bcmath' '--enable-debugger' 
'--enable-ftp=shared' '--enable-magic-quotes' '--enable-safe-mode' 
'--enable-sockets' '--enable-sysvsem=shared' '--enable-sysvshm=shared' 
'--enable-discard-path' '--enable-track-vars' '--enable-trans-sid' 
'--enable-yp' '--enable-wddx' '--without-oci8' '--with-imap=shared' 
'--with-imap-ssl' '--with-kerberos=/usr/kerberos' '--with-ldap=shared' 
'--with-mysql=shared,/usr' '--with-pgsql=shared' 
'--with-snmp=shared,/usr' '--with-snmp=shared' '--enable-ucd-snmp-hack' 
'--with-unixODBC=shared' '--enable-memory-limit' '--enable-bcmath' 
'--enable-shmop' '--enable-versioning' '--enable-calendar' 
'--enable-dbx' '--enable-dio' '--enable-mcal' '--enable-mbstring' 
'--enable-mbstr-enc-trans' '--with-apxs=/usr/sbin/apxs'

But I get  "configure: error: Cannot find rfc822.h. Please check your 
IMAP installation." I'm fairly new to Linux administration, so I don't 
know what to do. Can someone please help?