Here is a patch to port GC library to NetBSD/macppc. If you are
using NetBSD on PowerMac, apply this patch first.

This patch is provided by K. Sunagawa (kei_sun@ba2.so-net.ne.jp).

Index: gc/dyn_load.c
===================================================================
RCS file: /cvsroot/w3m/gc/dyn_load.c,v
retrieving revision 1.1.1.2
retrieving revision 1.2
diff -u -u -r1.1.1.2 -r1.2
--- gc/dyn_load.c	1999/06/02 19:29:13	1.1.1.2
+++ gc/dyn_load.c	1999/06/03 12:44:49	1.2
@@ -48,7 +48,8 @@
 #if !defined(SUNOS4) && !defined(SUNOS5DL) && !defined(IRIX5) && \
     !defined(MSWIN32) && !(defined(ALPHA) && defined(OSF1)) && \
     !defined(HP_PA) && !(defined(LINUX) && defined(__ELF__)) && \
-    !defined(RS6000) && !defined(SCO_ELF)
+    !defined(RS6000) && !defined(SCO_ELF) && \
+    !(defined(NETBSD) && defined(POWERPC))
  --> We only know how to find data segments of dynamic libraries for the
  --> above.  Additional SVR4 variants might not be too
  --> hard to add.
@@ -260,14 +261,22 @@
 # endif /* !USE_PROC ... */
 # endif /* SUNOS */
 
-#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF)
+#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
+    (defined(NETBSD) && defined(POWERPC))
 
 /* Dynamic loading code for Linux running ELF. Somewhat tested on
  * Linux/x86, untested but hopefully should work on Linux/Alpha. 
  * This code was derived from the Solaris/ELF support. Thanks to
  * whatever kind soul wrote that.  - Patrick Bridges */
 
+#if defined(NETBSD)
+#include <sys/exec_elf.h>
+#define DT_DEBUG	21
+#define PT_LOAD		1
+#define PF_W		0x2
+#else
 #include <elf.h>
+#endif
 #include <link.h>
 
 /* Newer versions of Linux/Alpha and Linux/x86 define this macro.  We
Index: gc/gcconfig.h
===================================================================
RCS file: /cvsroot/w3m/gc/gcconfig.h,v
retrieving revision 1.1.1.2
retrieving revision 1.2
diff -u -u -r1.1.1.2 -r1.2
--- gc/gcconfig.h	1999/06/02 19:29:18	1.1.1.2
+++ gc/gcconfig.h	1999/06/03 12:44:49	1.2
@@ -48,6 +48,11 @@
 #    define NETBSD
 #    define mach_type_known
 # endif
+# if defined(__NetBSD__) && defined(__powerpc__)
+#    define POWERPC
+#    define NETBSD
+#    define mach_type_known
+# endif
 # if defined(vax)
 #    define VAX
 #    ifdef ultrix
@@ -486,8 +491,8 @@
 
 # ifdef POWERPC
 #   define MACH_TYPE "POWERPC"
-#   define ALIGNMENT 2
 #   ifdef MACOS
+#     define ALIGNMENT 2
 #     ifndef __LOWMEM__
 #     include <LowMem.h>
 #     endif
@@ -497,6 +502,7 @@
 #     define DATAEND  /* not needed */
 #   endif
 #   ifdef LINUX
+#     define ALIGNMENT 2
 #     define OS_TYPE "LINUX"
 #     define HEURISTIC1
 #     undef STACK_GRAN
@@ -504,6 +510,14 @@
 #     define DATASTART GC_data_start
       extern int _end;
 #     define DATAEND (&_end)
+#   endif
+#   ifdef NETBSD
+#     define ALIGNMENT 4
+#     define OS_TYPE "NETBSD"
+#     define HEURISTIC2
+      extern char etext;
+#     define DATASTART GC_data_start
+#     define DYNAMIC_LOADING
 #   endif
 # endif
 
Index: gc/misc.c
===================================================================
RCS file: /cvsroot/w3m/gc/misc.c,v
retrieving revision 1.1.1.1
retrieving revision 1.2
diff -u -u -r1.1.1.1 -r1.2
--- gc/misc.c	1999/06/02 19:23:56	1.1.1.1
+++ gc/misc.c	1999/06/03 12:44:50	1.2
@@ -433,6 +433,9 @@
 #   if defined(LINUX) && defined(SPARC)
 	GC_init_linuxsparc();
 #   endif
+#   if defined(NETBSD) && defined(POWERPC)
+	GC_init_netbsd_powerpc();
+#   endif
 #   ifdef SOLARIS_THREADS
 	GC_thr_init();
 	/* We need dirty bits in order to find live stack sections.	*/
Index: gc/os_dep.c
===================================================================
RCS file: /cvsroot/w3m/gc/os_dep.c,v
retrieving revision 1.1.1.2
retrieving revision 1.2
diff -u -u -r1.1.1.2 -r1.2
--- gc/os_dep.c	1999/06/02 19:29:10	1.1.1.2
+++ gc/os_dep.c	1999/06/03 12:44:50	1.2
@@ -84,6 +84,19 @@
 #  include <machine/trap.h>
 #endif
 
+#if defined(NETBSD) && defined(POWERPC)
+  ptr_t GC_data_start;
+
+  void GC_init_netbsd_powerpc()
+  {
+    extern ptr_t GC_find_limit();
+    extern char **environ;
+	/* This may need to be environ, without the underscore, for	*/
+	/* some versions.						*/
+    GC_data_start = GC_find_limit((ptr_t)&environ, FALSE);
+  }
+#endif
+
 #ifdef AMIGA
 # include <proto/exec.h>
 # include <proto/dos.h>