bsdiff: force off_t to be 64 bits, honor size_t length

dev-util/bsdiff/bsdiff-4.3-r1.ebuild

 # Copyright 1999-2010 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/dev-util/bsdiff/bsdiff-4.3-r1.ebuild,v 1.12 2010/01/15 21:21:10 fauli Exp $
 
 inherit eutils toolchain-funcs flag-o-matic
 
 EAPI=2
 IUSE=""
 
 DESCRIPTION="bsdiff: Binary Differencer using a suffix alg"
 HOMEPAGE="http://www.daemonology.net/bsdiff/"
 SRC_URI="http://www.daemonology.net/bsdiff/${P}.tar.gz"
 
 SLOT="0"
 LICENSE="BSD-2"
 KEYWORDS="alpha amd64 arm hppa ia64 mips ppc sparc x86 ~x86-fbsd ~x86-freebsd ~amd64-linux ~x86-linux ~ppc-macos"
 
 DEPEND="app-arch/bzip2"
 RDEPEND="${DEPEND}"
 
 src_prepare() {
         epatch ${FILESDIR}/4.3_bspatch-support-input-output-positioning.patch
 }
 
 src_compile() {
         append-lfs-flags
-        $(tc-getCC) ${CFLAGS} ${LDFLAGS} -o bsdiff bsdiff.c -lbz2 || die "failed compiling bsdiff"
-        $(tc-getCC) ${CFLAGS} ${LDFLAGS} -o bspatch bspatch.c -lbz2 || die "failed compiling bspatch"
+        $(tc-getCC) ${CFLAGS} -D_FILE_OFFSET_BITS=64 ${LDFLAGS} -o bsdiff bsdiff.c -lbz2 || die "failed compiling bsdiff"
+        $(tc-getCC) ${CFLAGS} -D_FILE_OFFSET_BITS=64 ${LDFLAGS} -o bspatch bspatch.c -lbz2 || die "failed compiling bspatch"
 }
 
 src_install() {
         dobin bs{diff,patch}
         doman bs{diff,patch}.1
 }