Compiling mod_jk2

[John]

I am trying to compile mod_jk2. However, I am getting an error that I
have not been able to fix. Here is a snippet of the output:
guess.server:
[echo] Apache2 /usr/local/apache2 true
[echo] Apache13 /usr true
[echo] IIS ${iis.home} ${iis.detect}
[echo] Iplanet ${iplanet.home} ${iplanet.detect}


init:

apache20:
[so] Compiling 0 out of 42

apache13:
[so] Compiling 39 out of 39
Compiling /usr/apache/jakarta-tomcat-connectors-4.1.27-src/jk/native2/server/apache13/mod_jk2.c
[so] Compile failed 1
/usr/apache/jakarta-tomcat-connectors-4.1.27-src/jk/native2/server/apache13/mod_jk2.c
:
:
[so] StdErr:
[so] In file included from
/usr/java/j2sdk1.4.2/include/httpd.h:72,
[so] from
/usr/apache/jakarta-tomcat-connectors-4.1.27-src/jk/native2/server/apache13/mod_jk2.c:68:
[so] /usr/java/j2sdk1.4.2/include/ap_config.h:58:17: apr.h: No
such file or directory
[so] /usr/java/j2sdk1.4.2/include/ap_config.h:59:23:
apr_hooks.h: No such file or directory