I looked and this was not part of it.

apt-get install php5-dev build-essential
phpize
./configure
make
make install

If I upgrade using dotdeb what will happen to all my own compiled extensions?

Do I need to compile/add these again to php.ini?
Sorry if I am asking about the obvious but I am quite new at this and got everything to work with trial and error.

root@DIB097 /usr/local/src/php5-5.2.13>dpkg-buildpackage
dpkg-buildpackage: set CFLAGS to default value: -g -O2
dpkg-buildpackage: set CPPFLAGS to default value:
dpkg-buildpackage: set LDFLAGS to default value:
dpkg-buildpackage: set FFLAGS to default value: -g -O2
dpkg-buildpackage: set CXXFLAGS to default value: -g -O2
dpkg-buildpackage: source package php5
dpkg-buildpackage: source version 5.2.13-0.dotdeb.0
dpkg-buildpackage: source changed by Guillaume Plessis
dpkg-buildpackage: host architecture amd64
debian/rules clean
dh_testdir
sed -i -e ’s/EXTRA_VERSION=”-0.dotdeb.0″/EXTRA_VERSION=”"/’ configure.in
rm -f configure aclocal.m4 config.sub config.guess ltmain.sh
rm -f build/libtool.m4 main/php_config.h.in
rm -f prepared-stamp
QUILT_PATCHES=debian/patches quilt –quiltrc /dev/null pop -a -R || test $? = 2
No patch removed
rm -rf .pc debian/stamp-patched
dh_testdir
dh_testroot
rm -f configure-apache2-stamp build-apache2-stamp
rm -f configure-apache2filter-stamp build-apache2filter-stamp
rm -f configure-cgi-stamp build-cgi-stamp
rm -f configure-cli-stamp build-cli-stamp
rm -f build-pear-stamp
rm -f install-stamp
rm -rf apache2-build
rm -rf apache2filter-build
rm -rf cgi-build
rm -rf cli-build
rm -rf pear-build pear-build-download
rm -f debian/copyright
rm -f test-results.txt
dh_clean
# clean up autogenerated cruft
cat debian/modulelist | while read package extname dsoname; do \
rm -f debian/php5-$package.postinst; \
done
for sapi in libapache2-mod-php5 libapache2-mod-php5filter php5-cgi php5-cli; do \
for cruft in postrm links; do \
rm -f debian/${sapi}.${cruft}; \
done; \
done
dpkg-source -b php5-5.2.13
dpkg-source: info: using source format `1.0′
dpkg-source: info: building php5 using existing php5_5.2.13.orig.tar.gz
dpkg-source: info: building php5 in php5_5.2.13-0.dotdeb.0.diff.gz
dpkg-source: warning: ignoring deletion of file aclocal.m4
dpkg-source: warning: ignoring deletion of file ltmain.sh
dpkg-source: warning: ignoring deletion of file configure
dpkg-source: warning: ignoring deletion of file config.guess
dpkg-source: warning: ignoring deletion of file config.sub
dpkg-source: warning: ignoring deletion of file ext/pdo/pdo_sql_parser.c.orig
dpkg-source: warning: ignoring deletion of file ext/date/lib/parse_date.c.orig
dpkg-source: warning: ignoring deletion of file ext/standard/url_scanner_ex.c.orig
dpkg-source: warning: ignoring deletion of file ext/standard/var_unserializer.c.orig
dpkg-source: warning: ignoring deletion of file main/php_config.h.in
dpkg-source: warning: ignoring deletion of file build/libtool.m4
dpkg-source: info: building php5 in php5_5.2.13-0.dotdeb.0.dsc
debian/rules build
QUILT_PATCHES=debian/patches quilt –quiltrc /dev/null push -a || test $? = 2
Applying patch 006-debian_quirks.patch
patching file configure.in
Hunk #1 succeeded at 985 (offset 51 lines).
Hunk #2 succeeded at 1019 (offset 51 lines).
Hunk #3 succeeded at 1074 with fuzz 2 (offset 51 lines).
Hunk #4 succeeded at 1145 (offset 51 lines).
patching file ext/ext_skel
patching file ext/session/session.c
Hunk #1 succeeded at 683 (offset 502 lines).
patching file php.ini-dist
Hunk #1 succeeded at 471 (offset 5 lines).
Hunk #2 succeeded at 488 (offset 5 lines).
Hunk #3 succeeded at 604 (offset 8 lines).
Hunk #4 succeeded at 940 (offset 4 lines).
Hunk #5 succeeded at 978 (offset 4 lines).
patching file php.ini-recommended
Hunk #1 succeeded at 522 (offset 6 lines).
Hunk #2 succeeded at 539 (offset 6 lines).
Hunk #3 succeeded at 655 (offset 9 lines).
Hunk #4 succeeded at 991 (offset 5 lines).
Hunk #5 succeeded at 1029 (offset 5 lines).
patching file sapi/caudium/config.m4
patching file sapi/cli/php.1.in
Hunk #1 succeeded at 308 with fuzz 1 (offset 2 lines).
patching file scripts/Makefile.frag
patching file scripts/php-config.in
patching file scripts/phpize.in

Applying patch 010-mail-header.patch
patching file ext/standard/mail.c
Hunk #1 succeeded at 210 with fuzz 2 (offset 28 lines).
Hunk #2 succeeded at 317 (offset 42 lines).
patching file main/main.c
Hunk #1 succeeded at 461 with fuzz 1 (offset 135 lines).
patching file main/php_globals.h
Hunk #1 succeeded at 162 (offset 10 lines).

Applying patch 011-suhosin.patch
patching file TSRM/TSRM.h
patching file TSRM/tsrm_virtual_cwd.c
patching file TSRM/tsrm_virtual_cwd.h
patching file Zend/Makefile.am
patching file Zend/Zend.dsp
patching file Zend/ZendTS.dsp
patching file Zend/zend.c
patching file Zend/zend.h
patching file Zend/zend_alloc.c
patching file Zend/zend_alloc.h
patching file Zend/zend_canary.c
patching file Zend/zend_compile.c
patching file Zend/zend_compile.h
patching file Zend/zend_constants.c
patching file Zend/zend_errors.h
patching file Zend/zend_hash.c
patching file Zend/zend_llist.c
can’t find file to patch at input line 1413
Perhaps you used the wrong -p or –strip option?
The text leading up to this was:
————————–
|diff -Nura php-5.2.13/configure suhosin-patch-5.2.13-0.9.7/configure
|— php-5.2.13/configure 2010-02-24 13:27:27.000000000 +0100
|+++ suhosin-patch-5.2.13-0.9.7/configure 2010-03-02 21:51:30.000000000 +0100
————————–
No file to patch. Skipping patch.
3 out of 3 hunks ignored
patching file configure.in
patching file ext/standard/basic_functions.c
patching file ext/standard/dl.c
patching file ext/standard/file.c
patching file ext/standard/file.h
patching file ext/standard/info.c
patching file ext/standard/syslog.c
patching file main/fopen_wrappers.c
patching file main/main.c
Hunk #2 succeeded at 1390 (offset 1 line).
Hunk #3 succeeded at 1431 (offset 1 line).
Hunk #4 succeeded at 1528 (offset 1 line).
Hunk #5 succeeded at 1690 (offset 1 line).
Hunk #6 succeeded at 1834 (offset 1 line).
Hunk #7 succeeded at 1887 (offset 1 line).
Hunk #8 succeeded at 1948 (offset 1 line).
patching file main/php.h
can’t find file to patch at input line 1780
Perhaps you used the wrong -p or –strip option?
The text leading up to this was:
————————–
|diff -Nura php-5.2.13/main/php_config.h.in suhosin-patch-5.2.13-0.9.7/main/php_config.h.in
|— php-5.2.13/main/php_config.h.in 2010-02-24 13:27:31.000000000 +0100
|+++ suhosin-patch-5.2.13-0.9.7/main/php_config.h.in 2010-03-02 21:51:30.000000000 +0100
————————–
No file to patch. Skipping patch.
1 out of 1 hunk ignored
patching file main/php_logos.c
patching file main/snprintf.c
patching file main/spprintf.c
patching file main/suhosin_globals.h
patching file main/suhosin_logo.h
patching file main/suhosin_patch.c
patching file main/suhosin_patch.h
patching file main/suhosin_patch.m4
patching file sapi/apache/mod_php5.c
patching file sapi/apache2filter/sapi_apache2.c
patching file sapi/apache2handler/sapi_apache2.c
patching file sapi/cgi/cgi_main.c
patching file sapi/cli/php_cli.c
patching file win32/build/config.w32
Patch 011-suhosin.patch does not apply (enforce with -f)
make: *** [debian/stamp-patched] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2

re: php5-xcache: I’ve said already that xcache.var_size had been set to “16M” (which should be enough). Oddly, after a restart this error appears to have gone – although it showed up as 16M in the phpinfo output already.