Hi I was trying to built a new base data type into postgres. i am using 7.4.8 on debian. There is already an eg in src/tutorial which gives code for intenal and external functions of a new type called complex. I tried to create a shared library for the file complex.c using "cc -fpic -c complex.c" and "cc -shared -o complex.so complex.c". That gave me a lot of errors like the header files "fmgr.h" and "postgres.h" did not exist. I did a "make" anyway. After that I went into postgres and tried to create the functions corresponding to the new type. It says the file complex.so could not be found. So the shared library seems to have not been created. When I installed postgres-7.4.8 there was some error when I gave "make install-all-headers", so I just did "make install". I think the header files required for server side development are not there due to that. I think they are still there in the include dir. How do I use those header files when I make a shared library and compile. If anybody has created datatypes and defined them please share your experience. Thank you Moginraj