These are notes taken while building the WRE 0.7.2 from source inside a FreeBSD 5.3-RELEASE jail. 

• LFTP: had to manually point to /usr/local/{lib,include}/ too

• Image Magick: had to use gmake

• libpng: had to create the /data/wre/prereqs/imagemagick/include/libpng folder, afterwards make install worked fine

• libapreq2: had to use gmake and manually point to libexpat:
  

  /data/wre/prereqs/perl/bin/perl Makefile.PL 
  --with-apache2-apxs=/data/wre/prereqs/apache/bin/apxs
  --with-expat=/data/wre/prereqs/apache/

• Now httpd would produce the error
  
  

  "Fatal error 'Spinlock called when not threaded.' at line 83 in file 
  /usr/src/lib/libpthread/thread/thr_spinlock.c (errno = 2)" 
  

and would dump core when starting the modperl-ed httpd. I had to use the following /etc/libmap.conf to get it going:

root@box# cat /etc/libmap.conf
libc_r.so.5             libthr.so.1
libc_r.so               libthr.so
libpthread.so.1         libthr.so.1
libpthread.so           libthr.so 

• Spectre would fail with the following message: "Cannot determine local time zone". Fixed with:

root@box# cp /usr/share/zoneinfo/America/Sao_Paulo /etc/localtime

That's it. Hope it helps someone else.