Not all du implementations on linux accept --apparent-size, so let the
user configure the arguments passed to du if required.

This fixes FS#47943.

Signed-off-by: Alastair Hughes <hobbitalast...@gmail.com>
---
 configure.ac | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index dd4ac04..40062f2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -327,12 +327,12 @@ AC_CHECK_MEMBERS([struct statfs.f_flags],,,[[#include 
<sys/param.h>
 GCC_VISIBILITY_CC
 
 # Host-dependant definitions
+DEFAULT_DUFLAGS=" -sk --apparent-size"
 INODECMD="stat -c '%i %n'"
 OWNERCMD="stat -c '%u:%g'"
 MODECMD="stat -c '%a'"
 SIZECMD="stat -c %s"
 SEDINPLACE="sed --follow-symlinks -i"
-DUFLAGS="-sk --apparent-size"
 STRIP_BINARIES="--strip-all"
 STRIP_SHARED="--strip-unneeded"
 STRIP_STATIC="--strip-debug"
@@ -343,7 +343,7 @@ case "${host_os}" in
                MODECMD="stat -f '%Lp'"
                SIZECMD="stat -f %z"
                SEDINPLACE="sed -i \"\""
-               DUFLAGS="-sk"
+               DEFAULT_DUFLAGS=" -sk"
                ;;
        darwin*)
                host_os_darwin=yes
@@ -352,13 +352,12 @@ case "${host_os}" in
                MODECMD="/usr/bin/stat -f '%Lp'"
                SIZECMD="/usr/bin/stat -f %z"
                SEDINPLACE="/usr/bin/sed -i ''"
-               DUFLAGS="-sk"
+               DEFAULT_DUFLAGS=" -sk"
                STRIP_BINARIES=""
                STRIP_SHARED="-S"
                STRIP_STATIC="-S"
                ;;
 esac
-
 AM_CONDITIONAL([DARWIN], test "x$host_os_darwin" = "xyes")
 AC_PATH_PROGS([DUPATH], [du], [du], [/usr/bin$PATH_SEPARATOR/bin] )
 AC_SUBST(INODECMD)
@@ -366,11 +365,16 @@ AC_SUBST(OWNERCMD)
 AC_SUBST(MODECMD)
 AC_SUBST(SIZECMD)
 AC_SUBST(SEDINPLACE)
-AC_SUBST(DUFLAGS)
 AC_SUBST(STRIP_BINARIES)
 AC_SUBST(STRIP_SHARED)
 AC_SUBST(STRIP_STATIC)
 
+# Flags for du
+if test "${DUFLAGS+set}" != "set"; then
+    DUFLAGS="${DEFAULT_DUFLAGS}"
+fi
+AC_ARG_VAR(DUFLAGS, [flags for du, overriding the default])
+
 # Variables plugged into makepkg.conf
 CARCH="${host%%-*}"
 CHOST="${host}"
-- 
2.9.3

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