can anybody help me please

Hi, there,
i need a help in creating new data type in postgresql. I've read the manual, create type, i have try to create the type
mentionedin the manual (chapter Extending SQL type). but to no avail.  
At first it was my cygwin installation that doesn't support C as the language using createlang. But my postgresql 7.2.2
onlinux Redhat 8, show the same behaviour. They only support plpgsql, pltcl,  etc. 

i also try to make a c program which only prints something like "Hello World", i include the postgresql.h file as
header,i found out that the file isn't anywhere in my computer. My question: where can i get it? Can somebody just tell
mewhere the resource is? 

i really appreciate those gurus who would like to help newbie like me.

regards,
rifki
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+   open mind, open heart, act !  +
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