diff -ru gc6.2alpha3/configure.in gc6.2alpha3-dylib/configure.in
--- gc6.2alpha3/configure.in	Wed Mar  5 15:01:13 2003
+++ gc6.2alpha3-dylib/configure.in	Wed Mar  5 10:36:29 2003
@@ -179,7 +179,14 @@
 esac
 AC_SUBST(THREADLIBS)
 
-AC_CHECK_LIB(dl, dlopen, EXTRA_TEST_LIBS="$EXTRA_TEST_LIBS -ldl")
+# I'm not too familiar with autoconf, is this the best way to do this? -Brian
+case "$host" in
+  *-*-darwin*) ;;
+  *) 
+    AC_CHECK_LIB(dl, dlopen, EXTRA_TEST_LIBS="$EXTRA_TEST_LIBS -ldl")
+    ;;
+esac
+
 AC_SUBST(EXTRA_TEST_LIBS)
 
 target_all=libgc.la
diff -ru gc6.2alpha3/dyn_load.c gc6.2alpha3-dylib/dyn_load.c
--- gc6.2alpha3/dyn_load.c	Thu Jan 23 19:34:21 2003
+++ gc6.2alpha3-dylib/dyn_load.c	Wed Mar  5 15:39:39 2003
@@ -57,7 +57,8 @@
     !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \
     !defined(RS6000) && !defined(SCO_ELF) && !defined(DGUX) && \
     !(defined(FREEBSD) && defined(__ELF__)) && \
-    !(defined(NETBSD) && defined(__ELF__)) && !defined(HURD)
+    !(defined(NETBSD) && defined(__ELF__)) && !defined(HURD) && \
+    !defined(MACOSX)
  --> We only know how to find data segments of dynamic libraries for the
  --> above.  Additional SVR4 variants might not be too
  --> hard to add.
@@ -1077,7 +1078,63 @@
 }
 #endif /* RS6000 */
 
+#ifdef MACOSX
 
+#include <mach-o/dyld.h>
+#include <mach-o/getsect.h>
+
+/*#define MACOSX_DEBUG */
+
+void GC_register_dynamic_libraries() 
+{
+    unsigned long image_count;
+    const struct mach_header *mach_header;
+    const struct section *sec;
+    unsigned long slide;
+    unsigned long filetype;
+    int i,j;
+    unsigned long start;
+    unsigned long end;
+    
+    static struct { 
+        const char *seg;
+        const char *sect;
+    } sections[] = {
+        { SEG_DATA, SECT_DATA },
+        { SEG_DATA, SECT_BSS },
+        { SEG_DATA, SECT_COMMON }
+    };
+    
+    image_count = _dyld_image_count();
+    for(i=0;i<image_count;i++)
+    {
+        mach_header = _dyld_get_image_header(i);
+        slide = _dyld_get_image_vmaddr_slide(i);
+        filetype = mach_header->filetype;
+        
+        for(j=0;j<sizeof(sections)/sizeof(sections[0]);j++) {
+            sec = getsectbynamefromheader(mach_header,sections[j].seg,sections[j].sect);
+            if(sec == NULL || sec->size == 0) continue;
+            start = slide + sec->addr;
+            end = start + sec->size;
+#			ifdef MACOSX_DEBUG
+                GC_printf4("Adding section at %p-%p (%lu bytes) from image %s\n",
+                    start,end,sec->size,_dyld_get_image_name(i));
+#			endif
+
+            GC_add_roots_inner((char*)start,(char*)end,
+                filetype == MH_EXECUTE ? FALSE : TRUE);
+        }
+    }
+}
+
+#define HAVE_REGISTER_MAIN_STATIC_DATA
+GC_bool GC_register_main_static_data()
+{
+  return FALSE;
+}
+
+#endif /* MACOSX */
 
 #else /* !DYNAMIC_LOADING */
 
diff -ru gc6.2alpha3/include/private/gcconfig.h gc6.2alpha3-dylib/include/private/gcconfig.h
--- gc6.2alpha3/include/private/gcconfig.h	Wed Mar  5 15:01:14 2003
+++ gc6.2alpha3-dylib/include/private/gcconfig.h	Wed Mar  5 10:27:26 2003
@@ -718,6 +718,7 @@
 #	define SIG_SUSPEND SIGXCPU
 #	define SIG_THR_RESTART SIGXFSZ
 #     endif
+#     define DYNAMIC_LOADING
       /* XXX: see get_end(3), get_etext() and get_end() should not be used */
 #     define DATASTART ((ptr_t) get_etext())
 #     define STACKBOTTOM ((ptr_t) 0xc0000000)