--- a/configure.ac	2004-09-19 10:28:33.000000000 +0200
+++ b/configure.ac	2006-02-27 16:12:00.282066250 +0100
@@ -16,6 +16,7 @@
 dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
+AC_PROG_LIBTOOL
 
 dnl Checks for libraries.
 
@@ -26,7 +27,6 @@
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_C_BIGENDIAN
-AC_CHECK_SIZEOF(void *)
 
 dnl Checks for library functions.
 AC_CHECK_FUNCS(getopt_long)
--- a/Makefile.am	2004-09-19 10:29:28.000000000 +0200
+++ b/Makefile.am	2006-02-27 16:57:31.166290750 +0100
@@ -12,12 +12,19 @@
 	fakeroot debian/rules binary
 
 chrpath_SOURCES = \
-	chrpath.c	\
-	killrpath.c	\
 	main.c		\
-	elf.c		\
 	protos.h
 
+chrpath_LDADD = -ldl
+
+lib_LTLIBRARIES = libchrpath32.la libchrpath64.la
+libchrpath32_la_SOURCES = chrpath.c killrpath.c elf.c protos.h
+libchrpath32_la_CFLAGS = -DSIZEOF_VOID_P=4
+libchrpath32_la_LDFLAGS = -avoid-version
+libchrpath64_la_SOURCES = chrpath.c killrpath.c elf.c protos.h
+libchrpath64_la_CFLAGS = -DSIZEOF_VOID_P=8
+libchrpath64_la_LDFLAGS = -avoid-version
+
 EXTRA_DIST = ChangeLog.usermap $(man_MANS)
 
 CLEANFILES = *.bb *.bbg *.da *.gcov testsuite/*.bb testsuite/*.bbg
--- a/main.c	2004-09-19 10:33:37.000000000 +0200
+++ b/main.c	2006-02-27 17:23:39.400267750 +0100
@@ -12,13 +12,19 @@
 #  include "config.h"
 #endif
 
+#include <dlfcn.h>
+#include <elf.h>
+#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #ifdef HAVE_GETOPT_H
 #include <getopt.h>
 #endif
-#include "protos.h"
+
+typedef int (*killrpath_t)(const char *filename);
+typedef int (*chrpath_t)(const char *filename, const char *newpath, int convert);
 
 #ifdef HAVE_GETOPT_LONG
 #  define GETOPT_LONG getopt_long
@@ -61,6 +67,30 @@
   printf("\n");
 }
 
+static unsigned
+elf_class(const char *filename)
+{
+   Elf32_Ehdr ehdr;
+   int fd;
+
+   fd = open(filename, O_RDONLY);
+   if (fd == -1)
+     return 0;
+   if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
+   {
+     close(fd);
+     return 0;
+   }
+   close(fd);
+   if ((memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0)
+       || (ehdr.e_ident[EI_VERSION] != EV_CURRENT))
+   {
+     fprintf(stderr, "`%s' probably isn't an ELF file.\n", filename);
+     return 0;
+   }
+   return ehdr.e_ident[EI_CLASS];
+}
+
 int
 main(int argc, char * const argv[])
 {
@@ -73,6 +103,9 @@
 #ifdef HAVE_GETOPT_LONG
   int option_index = 0;
 #endif /* HAVE_GETOPT_LONG */
+  void* dll[2];
+  killrpath_t killrpath[2];
+  chrpath_t chrpath[2];
 
   if (argc < 2)
     {
@@ -116,14 +149,31 @@
       }
   } while (-1 != opt);
 
+  dll[0] = dlopen("libchrpath32.so", RTLD_LAZY);
+  killrpath[0] = (killrpath_t)dlsym(dll[0], "killrpath");
+  chrpath[0] = (chrpath_t)dlsym(dll[0], "chrpath");
+
+  dll[1] = dlopen("libchrpath64.so", RTLD_LAZY);
+  killrpath[1] = (killrpath_t)dlsym(dll[1], "killrpath");
+  chrpath[1] = (chrpath_t)dlsym(dll[1], "chrpath");
+
   while (optind < argc && (!retval || keep_going))
     {
+      const char* program = argv[optind++];
+      unsigned eclass = elf_class(program);
+      if (!eclass)
+      {
+        retval = 1;
+        continue;
+      }
       if (remove)
-        retval |= killrpath(argv[optind++]);
+        retval |= killrpath[eclass - ELFCLASS32](program);
       else
         /* list by default, replace if path is set */
-        retval |= chrpath(argv[optind++], newpath, convert);
+        retval |= chrpath[eclass - ELFCLASS32](program, newpath, convert);
     }
 
+  dlclose(dll[0]);
+  dlclose(dll[1]);
   return retval;
 }