--- thirdparty_unman/chmlib/configure.orig
+++ thirdparty_unman/chmlib/configure
@@ -11536,9 +11536,9 @@ fi
 
 
 if test -n "$CHM_USE_IO64"; then
-    { $as_echo "$as_me:$LINENO: checking for lseek64" >&5
-$as_echo_n "checking for lseek64... " >&6; }
-if test "${ac_cv_func_lseek64+set}" = set; then
+    { $as_echo "$as_me:$LINENO: checking for lseek" >&5
+$as_echo_n "checking for lseek... " >&6; }
+if test "${ac_cv_func_lseek+set}" = set; then
   $as_echo_n "(cached) " >&6
 else
   cat >conftest.$ac_ext <<_ACEOF
@@ -11547,12 +11547,12 @@ _ACEOF
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
-/* Define lseek64 to an innocuous variant, in case <limits.h> declares lseek64.
+/* Define lseek to an innocuous variant, in case <limits.h> declares lseek.
    For example, HP-UX 11i <limits.h> declares gettimeofday.  */
-#define lseek64 innocuous_lseek64
+#define lseek innocuous_lseek
 
 /* System header to define __stub macros and hopefully few prototypes,
-    which can conflict with char lseek64 (); below.
+    which can conflict with char lseek (); below.
     Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
     <limits.h> exists even on freestanding compilers.  */
 
@@ -11562,7 +11562,7 @@ cat >>conftest.$ac_ext <<_ACEOF
 # include <assert.h>
 #endif
 
-#undef lseek64
+#undef lseek
 
 /* Override any GCC internal prototype to avoid an error.
    Use char because int might match the return type of a GCC
@@ -11570,18 +11570,18 @@ cat >>conftest.$ac_ext <<_ACEOF
 #ifdef __cplusplus
 extern "C"
 #endif
-char lseek64 ();
+char lseek ();
 /* The GNU C library defines this for functions which it implements
     to always fail with ENOSYS.  Some functions are actually named
     something starting with __ and the normal name is an alias.  */
-#if defined __stub_lseek64 || defined __stub___lseek64
+#if defined __stub_lseek || defined __stub___lseek
 choke me
 #endif
 
 int
 main ()
 {
-return lseek64 ();
+return lseek ();
   ;
   return 0;
 }
@@ -11607,21 +11607,21 @@ $as_echo "$ac_try_echo") >&5
 	 test "$cross_compiling" = yes ||
 	 $as_test_x conftest$ac_exeext
        }; then
-  ac_cv_func_lseek64=yes
+  ac_cv_func_lseek=yes
 else
   $as_echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
-	ac_cv_func_lseek64=no
+	ac_cv_func_lseek=no
 fi
 
 rm -rf conftest.dSYM
 rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
       conftest$ac_exeext conftest.$ac_ext
 fi
-{ $as_echo "$as_me:$LINENO: result: $ac_cv_func_lseek64" >&5
-$as_echo "$ac_cv_func_lseek64" >&6; }
-if test "x$ac_cv_func_lseek64" = x""yes; then
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_func_lseek" >&5
+$as_echo "$ac_cv_func_lseek" >&6; }
+if test "x$ac_cv_func_lseek" = x""yes; then
   :
 else