Help compiling new module

I've read the "Creating Extensions" section, and I'm stuck on what is probably a simple C question. 'make' produces this: ext/u2/u2.lo: In function `zif_ic_opensession': /usr/php-4.3.1/ext/u2/u2.c:200: undefined reference to `ic_opensession' collect2: ld returned 1 exit status make: *** [sapi/cli/php] Error 1 The manual says "The only problem that could arise is that the compiler will complain about missing definitions or something similar. In this case, make sure that all header files are available and that you specified their path correctly in the compilation command." That's where I'm stuck. I could probably figure it out if I were using gcc directly, but I don't know how to tell the buildconf/configure scripts what they need to know to find the intcall.h file living in /usr/unishared/icsdk. At least, I'm pretty sure it's a missing header file producing that error. Or do I just copy all the stuff in that header file into the php_u2.h file that ext_skel created for me? I think this should be an easy extension, I'm just trying to create a wrapper around an existing C library. (InterCall, provided by IBM to access their UniVerse/UniData databases.) Unfortunately I'm far more familiar with Java and UniData than C and PHP. Can anyone help me past this sticking point? Thanks in advance! -- Wendy Smoak Chandler, AZ