SHLIB works but inline compilation does not

Hi,

I appear to be able to compile, load and call shared objects using SHLIB
and .Call:

code <- '#include <R.h>\n #include <Rdefines.h>\n SEXP f(){\n return
R_NilValue ; }' 
writeLines( code, "test.c" ) 
system( "R CMD SHLIB test.c" )

gcc -arch i386 -std=gnu99
-I/Library/Frameworks/R.framework/Resources/include
-I/Library/Frameworks/R.framework/Resources/include/i386 
-I/usr/local/include    -fPIC  -g -O2 -c test.c -o test.o
gcc -arch i386 -std=gnu99 -dynamiclib -Wl,-headerpad_max_install_names
-mmacosx-version-min=10.4 -undefined dynamic_lookup -single_module
-multiply_defined suppress -L/usr/local/lib -o test.so test.o
-F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework
-Wl,CoreFoundation

dyn.load( "test.so" ) 
.Call( "f" ) 

NULL

The above follows Romaine-Francois 3's suggestion here:
http://n4.nabble.com/I-can-t-run-the-example-shown-in-the-inline-package-td1774328.html#a1778838

However, when I try to use the "inline" package, I can't get it to work:

code <- "

+ 	int i, j, nab = *na + *nb - 1; 
+ 	for(i = 0; i < nab; i++) 
+ 	  ab[i] = 0.0; 
+ 	for(i = 0; i < *na; i++) {
+ 	  for(j = 0; j < *nb; j++) 
+ 			  ab[i + j] += a[i] * b[j]; 
+ 	}"

fun <- cfunction(

+ 	signature(a="numeric", na="numeric", b="numeric", nb="numeric",
ab="numeric"), 
+ 	code, 
+ 	language="C", 
+ 	convention=".C"	)

ERROR(s) during compilation: source code errors or compiler configuration
errors!

Program source:
  1: #include <R.h>
  2: 
  3: 
  4: void file4431b782 ( double * a, double * na, double * b, double * nb,
double * ab ) {
  5: 
  6: 	int i, j, nab = *na + *nb - 1; 
  7: 	for(i = 0; i < nab; i++) 
  8: 	  ab[i] = 0.0; 
  9: 	for(i = 0; i < *na; i++) {
 10: 	  for(j = 0; j < *nb; j++) 
 11: 			  ab[i + j] += a[i] * b[j]; 
 12: 	}
 13: }
Error in compileCode(f, code, language, verbose) : 
  Compilation ERROR, function(s)/method(s) not created!

The C function above is the one from "Writing R Extensions", p. 79; the
suggestion for how to compile it inline is from Dirk Eddelbuettel, at this
thread:
http://n4.nabble.com/Getting-started-with-C-td1837912.html#a1837912

R says it's either a source code or configuration error.  I got the code
from "Writing R Extensions", and Dirk tried it out too.  But if it's a
compilation error, then shouldn't the first method (with SHLIB) not work
either?

I realize I could stick to the SHLIB method, which Charlie ("The Sharpie")
Sharpsteen wrote up in fantastic detail here:
http://n4.nabble.com/Writing-own-simulation-function-in-C-td1580190.html#a1580423
But there's so much more stuff I'll need to understand if I do it that way
...

I use an Intel MacBook Pro with OS X 10.6.2, XCode 3.2.1, gcc 4.2.1.

Thanks,
Jeff