thanks for you support, ... I have tried to install apache_1.3.14 and mod_perl-1.24_01. No problems with perl Makefile.PL , and make, but after I tried to run the make test I got this error "letting apache warm up .......\c Can't located loadable object for module Apache::Constants in @INC ...( @INC contains: /usr/src/mod_perl-1.24_01/blib/lib /usr/src/mod_perl-1.24_01/blib/arch /usr/src/mod_perl-1.24_01/t/docs /usr/lib/perl5/site_perl/5.005/i386-linux blib/arch blib/lib /usr/lib/perl5/5.0053/i386-linux /usr/lib/perl5/5.0053 /usr/lib/perl5/site_perl/5.005/i386-linux /usr/lib/perl5/site_perl/5.005/ /usr/src/mod_perl-1.24_01/t/ /usr/src/mod_perl-1.24_01/t/lib/perl at /usr/src/mod_perl-1.24_01/blib/lib/mo_perl.pm line 16 Begin failed--compilation aborted at /usr/src/mod_perl-1.24_01/blib/lib/Apache.pm line 6 Begin failed--compilation aborted at /usr/src/mod_perl-1.24_01/t//docs/startup.pl line 38 The system is Linux red hat 6.1 Comipled mod_perl-1.24_01 first perl Makefile.PL APACHE_SRC=/usr/src/apache_1.3.14/src DO_HTTPD=1 APACHE_PREFIX=/usr/local/apache EVERYTHING=1 make make test ( here I got the error) THANKS AGAIN