I found a minor problem in httpd-devel-2.0.46-32.ent.3.centos.1 package in files used for developement for Apache webserver in directory /usr/lib/httpd/build thee a re weird INCLIDES paths: # pwd /usr/lib/httpd/build # grep cent * apr_rules.mk:apr_builddir=/home/centos/upd2/BUILD/httpd-2.0.46/prefork/srclib/apr apr_rules.mk:apr_builders=/home/centos/upd2/BUILD/httpd-2.0.46/srclib/apr/build config_vars.mk:APR_INCLUDEDIR = /home/centos/upd2/BUILD/httpd-2.0.46/prefork/srclib/apr/include /home/centos/upd2/BUILD/httpd-2.0.46/srclib/apr/include config_vars.mk:APU_INCLUDEDIR = /home/centos/upd2/BUILD/httpd-2.0.46/prefork/srclib/apr-util/include /home/centos/upd2/BUILD/httpd-2.0.46/srclib/apr-util/include those "dirs" should point to "real" include directories (at least in config_vars.mk)... when I overwrite APR_INCLUDEDIR and APU_INCLUDEDIR in config_vars.mk to /usr/include/http compilation works OK by Petr Klima