Problems install mod_security on Centos 4

[panaman]

i am getting this error...

[root@138 apache2]# /usr/sbin/apxs -cia mod_security2.c
/bin/sh /usr/lib/apr/build/libtool --silent --mode=compile gcc -prefer-pic -O2 -g -pipe -m32 -march=i386 -mtune=pentium4 -DAP_HAVE_DESIGNATED_INITIALIZER -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -pthread -I/usr/include/apr-0 -I/usr/include/httpd -c -o mod_security2.lo mod_security2.c && touch mod_security2.slo
In file included from modsecurity.h:37,
from mod_security2.c:18:
msc_pcre.h:18:18: pcre.h: No such file or directory
apxs:Error: Command failed with rc=65536

here are my apache versions and pcre
[root@138 apache2]# rpm -qa |grep pcre
pcre-4.5-3.2.RHEL4
pcre-devel-4.5-3.2.RHEL4
[root@138 apache2]# rpm -qa |grep httpd
httpd-2.0.52-28.ent.centos4
httpd-suexec-2.0.52-28.ent.centos4
httpd-devel-2.0.52-28.ent.centos4
[root@138 apache2]#

anyone got any ideas?