http://bugs.gentoo.org/show_bug.cgi?id=204208
libelf.h should use __off64_t, as off64_t is not always defined.
2008-01-03 Martin von Gagern

diff -ur elfutils-0.131/libelf/libelf.h elfutils/libelf/libelf.h
--- elfutils-0.131/libelf/libelf.h	2007-11-11 20:29:00.000000000 +0100
+++ elfutils/libelf/libelf.h	2008-01-03 23:15:36.000000000 +0100
@@ -95,7 +95,7 @@
   Elf_Type d_type;		/* Type of this piece of data.  */
   unsigned int d_version;	/* ELF version.  */
   size_t d_size;		/* Size in bytes.  */
-  off64_t d_off;		/* Offset into section.  */
+  __off64_t d_off;		/* Offset into section.  */
   size_t d_align;		/* Alignment in section.  */
 } Elf_Data;
 
@@ -157,7 +157,7 @@
   uid_t ar_uid;			/* User ID.  */
   gid_t ar_gid;			/* Group ID.  */
   mode_t ar_mode;		/* File mode.  */
-  off64_t ar_size;		/* File size.  */
+  __off64_t ar_size;		/* File size.  */
   char *ar_rawname;		/* Original name of archive member.  */
 } Elf_Arhdr;
 
@@ -198,13 +198,13 @@
 extern int elf_end (Elf *__elf);
 
 /* Update ELF descriptor and write file to disk.  */
-extern off64_t elf_update (Elf *__elf, Elf_Cmd __cmd);
+extern __off64_t elf_update (Elf *__elf, Elf_Cmd __cmd);
 
 /* Determine what kind of file is associated with ELF.  */
 extern Elf_Kind elf_kind (Elf *__elf) __attribute__ ((__pure__));
 
 /* Get the base offset for an object file.  */
-extern off64_t elf_getbase (Elf *__elf);
+extern __off64_t elf_getbase (Elf *__elf);
 
 
 /* Retrieve file identification data.  */
@@ -302,7 +302,7 @@
    would be for TYPE.  The resulting Elf_Data pointer is valid until
    elf_end (ELF) is called.  */
 extern Elf_Data *elf_getdata_rawchunk (Elf *__elf,
-				       off64_t __offset, size_t __size,
+				       __off64_t __offset, size_t __size,
 				       Elf_Type __type);
 
 
@@ -314,7 +314,7 @@
 extern Elf_Arhdr *elf_getarhdr (Elf *__elf);
 
 /* Return offset in archive for current file ELF.  */
-extern off64_t elf_getaroff (Elf *__elf);
+extern __off64_t elf_getaroff (Elf *__elf);
 
 /* Select archive element at OFFSET.  */
 extern size_t elf_rand (Elf *__elf, size_t __offset);