I am trying to link IDL to a C program. I followed the calltest example in the manual and received the following error message: make: *** No rule to make target `calltest.c', needed by `calltest.o'. Stop. When I tried it with my own programs I received the message: ld: Undefined symbols: _main _a_angleconv _a_convert I am running idl using X11 on Mac OS 10.3.4. Help!! What am I missing?