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apxs -cia mod_security.c
...
Libraries have been installed in:
   /usr/lib/apache2/modules
...

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x03:/etc/init.d/apache2 force-reload
Syntax error on line 1 of /etc/apache2/mods-enabled/mod-security.load:
Cannot load /usr/lib/apache2/modules/mod_security2.so into server: /usr/lib/apache2/modules/mod_security2.so: undefined symbol: msc_alert

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x03:cat /etc/apache2/mods-enabled/mod-security.load
LoadModule security2_module /usr/lib/apache2/modules/mod_security2.so

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x03:/usr/local# ls -al /usr/lib/apache2/modules|grep security2.so
-rw-r--r--  1 root root  25183 Nov  9 13:27 mod_security2.so

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server03:/usr/src/modsecurity-apache_2.0.3/apache2# apxs2 -cia mod_security2.c
/usr/bin/libtool --silent --mode=compile gcc -prefer-pic -pipe -I/usr/include/xmltok -I/usr/include/openssl -Wall -O2 -DAP_HAVE_DESIGNATED_INITIALIZER -DLINUX=2 -D_REENTRANT -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -D_SVID_SOURCE -D_GNU_SOURCE -pipe -I/usr/include/xmltok -I/usr/include/openssl -Wall -O2 -pthread -I/usr/include/apache2  -I/usr/include/apr-0   -I/usr/include/apr-0 -I/usr/include  -c -o mod_security2.lo mod_security2.c && touch mod_security2.slo
/usr/bin/libtool --silent --mode=link gcc -o mod_security2.la  -rpath /usr/lib/apache2/modules -module -avoid-version    mod_security2.lo
/usr/share/apache2/build/instdso.sh SH_LIBTOOL='/usr/bin/libtool' mod_security2.la /usr/lib/apache2/modules
/usr/bin/libtool --mode=install cp mod_security2.la /usr/lib/apache2/modules/
cp .libs/mod_security2.so /usr/lib/apache2/modules/mod_security2.so
cp .libs/mod_security2.lai /usr/lib/apache2/modules/mod_security2.la
cp .libs/mod_security2.a /usr/lib/apache2/modules/mod_security2.a
ranlib /usr/lib/apache2/modules/mod_security2.a
chmod 644 /usr/lib/apache2/modules/mod_security2.a
PATH="$PATH:/sbin" ldconfig -n /usr/lib/apache2/modules
----------------------------------------------------------------------
Libraries have been installed in:
   /usr/lib/apache2/modules

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,--rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
chmod 644 /usr/lib/apache2/modules/mod_security2.so
[activating module `security2' in /etc/apache2/httpd.conf]
server03:/usr/src/modsecurity-apache_2.0.3/apache2#

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server03:/usr/share/apache2/build# dpkg -l|grep glibc
ii  libdb1-compat  2.1.3-7        The Berkeley database routines [glibc 2.0/2

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server03:/usr/share/apache2/build# ldd -d /usr/sbin/apache2
        libdl.so.2 => /lib/tls/libdl.so.2 (0xb7f63000)
        libcrypt.so.1 => /lib/tls/libcrypt.so.1 (0xb7f35000)
        libpcre.so.3 => /usr/lib/libpcre.so.3 (0xb7f25000)
        libz.so.1 => /usr/lib/libz.so.1 (0xb7f13000)
        libssl.so.0.9.7 => /usr/lib/i686/cmov/libssl.so.0.9.7 (0xb7ee2000)
        libcrypto.so.0.9.7 => /usr/lib/i686/cmov/libcrypto.so.0.9.7 (0xb7de3000)
        libaprutil-0.so.0 => /usr/lib/libaprutil-0.so.0 (0xb7dce000)
        libldap_r.so.2 => /usr/lib/libldap_r.so.2 (0xb7d97000)
        liblber.so.2 => /usr/lib/liblber.so.2 (0xb7d8a000)
        libdb-4.2.so => /usr/lib/libdb-4.2.so (0xb7cb4000)
        libexpat.so.1 => /usr/lib/libexpat.so.1 (0xb7c94000)
        libapr-0.so.0 => /usr/lib/libapr-0.so.0 (0xb7c73000)
        librt.so.1 => /lib/tls/librt.so.1 (0xb7c6d000)
        libm.so.6 => /lib/tls/libm.so.6 (0xb7c4a000)
        libnsl.so.1 => /lib/tls/libnsl.so.1 (0xb7c36000)
        libpthread.so.0 => /lib/tls/libpthread.so.0 (0xb7c27000)
        libc.so.6 => /lib/tls/libc.so.6 (0xb7af2000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0xb7f6c000)
        libresolv.so.2 => /lib/tls/libresolv.so.2 (0xb7ae0000)
        libsasl2.so.2 => /usr/lib/libsasl2.so.2 (0xb7acb000)
        libgnutls.so.11 => /usr/lib/libgnutls.so.11 (0xb7a63000)
        libtasn1.so.2 => /usr/lib/libtasn1.so.2 (0xb7a52000)
        libgcrypt.so.11 => /usr/lib/libgcrypt.so.11 (0xb7a05000)
        libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0xb7a01000)

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grep -r msc_alert *

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modsecurity-apache_2.0.3/apache2/mod_security2.c:    msc_alert(msr, 1, actionset, message, msr->intercept_message);
modsecurity-apache_2.0.3/apache2/modsecurity.c:void msc_alert(modsec_rec *msr, int level, msre_actionset *actionset, const char *action_message,
modsecurity-apache_2.0.3/apache2/modsecurity.h:void DSOLOCAL msc_alert(modsec_rec *msr, int level, msre_actionset *actionset, const char *action_message,
modsecurity-apache_2.0.3/apache2/re.c:        msc_alert(msr, (actionset->log == 0 ? 4 : 2), actionset,

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 grep modsecurity.h *
apache2_config.c:#include "modsecurity.h"
apache2_io.c:#include "modsecurity.h"
apache2_util.c:#include "modsecurity.h"
mod_security2.c:#include "modsecurity.h"
modsecurity.c:#include "modsecurity.h"
modsecurity.h: * $Id: modsecurity.h,v 1.10 2006/10/26 10:02:42 ivanr Exp $
modules.mk:H = re.h modsecurity.h msc_logging.h msc_multipart.h msc_parsers.h 
msc_logging.h:#include "modsecurity.h"
msc_multipart.h:#include "modsecurity.h"
msc_parsers.h:#include "modsecurity.h"
msc_pcre.h:#include "modsecurity.h"
msc_reqbody.c:#include "modsecurity.h"
msc_util.h:#include "modsecurity.h"
msc_xml.h:#include "modsecurity.h"
persist_dbm.h:#include "modsecurity.h"
re.h:#include "modsecurity.h"
re_variables.c:#include "modsecurity.h"