guile dlopen problems on Mac OS X

[Ken Raeburn]

After installing 1.9.1 on Mac OS X (10.5.7), and updating $PATH to  
point to the installation 'bin' directory:

% guile-tools compile -o ack.go ack.scm
ERROR: In procedure dynamic-link:
ERROR: file: "libguile-srfi-srfi-1-v-4", message: "dlopen(libguile- 
srfi-srfi-1-v-4.so, 9): image not found"
%

The correct suffix for dynamically-linked libraries on Mac OS X is  
".dylib".

% find dev/guile/guile-1.9.1/b/I -name \*srfi-1-v-4\* -print
dev/guile/guile-1.9.1/b/I/lib/libguile-srfi-srfi-1-v-4.4.dylib
dev/guile/guile-1.9.1/b/I/lib/libguile-srfi-srfi-1-v-4.a
dev/guile/guile-1.9.1/b/I/lib/libguile-srfi-srfi-1-v-4.dylib
dev/guile/guile-1.9.1/b/I/lib/libguile-srfi-srfi-1-v-4.la
%

However, even if I make a symlink with the .so suffix, I still get the  
same error reported.  If I also set LD_LIBRARY_PATH to point to this  
directory, then it works.  But this isn't necessary to simply invoke  
the "guile" or "guile-tools" executables.  Perhaps they should ensure  
that the installation library directory gets searched via one of the  
environment variables dlopen checks, or check that directory  
explicitly if dlopen fails?  They do have built-in knowledge of where  
to find the Scheme code they want to load; why should the supplied  
executable libraries be different?

Ken