Posix regex.h cannot be found during ldap install

[daniel <daniel@electroteque.org>]

can anyone please help me with this ? i cannot install ldap and need ldap 
going before i can install all the other packages using it as its user 
backend, i rebuilt my linux box , and for some reason it thinks gcc is 
buggered but every other package compiles fine and when i gcc -v i get the 
latest version and enabled posix threads in the configure line , if someone 
else has experienced this please let me know thanks.