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установил его значит вот так вот:

# /opt/lampp/bin/apxs -n modsecurity -cia modsecurity.c
/opt/lampp/build/libtool --silent --mode=compile gcc -prefer-pic -O6 -I/opt/lampp/include -L/opt/lampp/lib  -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -pthread -I/opt/lampp/include  -I/opt/lampp/include   -I/opt/lampp/include -I/opt/lampp/include  -c -o modsecurity.lo modsecurity.c && touch modsecurity.slo
/opt/lampp/build/libtool --silent --mode=link gcc -o modsecurity.la  -rpath /opt/lampp/modules -module -avoid-version    modsecurity.lo
/opt/lampp/build/instdso.sh SH_LIBTOOL='/opt/lampp/build/libtool' modsecurity.la /opt/lampp/modules
/opt/lampp/build/libtool --mode=install cp modsecurity.la /opt/lampp/modules/
cp .libs/modsecurity.so /opt/lampp/modules/modsecurity.so
cp .libs/modsecurity.lai /opt/lampp/modules/modsecurity.la
cp .libs/modsecurity.a /opt/lampp/modules/modsecurity.a
ranlib /opt/lampp/modules/modsecurity.a
chmod 644 /opt/lampp/modules/modsecurity.a
PATH="$PATH:/sbin" ldconfig -n /opt/lampp/modules
----------------------------------------------------------------------
Libraries have been installed in:
   /opt/lampp/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 755 /opt/lampp/modules/modsecurity.so
[activating module `modsecurity' in /opt/lampp/etc/httpd.conf]


но при перезагрузке апача выдает

httpd: Syntax error on line 128 of /opt/lampp/etc/httpd.conf: Cannot load /opt/lampp/modules/modsecurity.so into server: /opt/lampp/modules/modsecurity.so: undefined symbol: parse_arguments                                                   


хотя в httpd.conf
LoadModule modsecurity_module modules/modsecurity.so