From acee9c0c46f71f1f4c33c2dadf69d19e24b90f27 Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Tue, 13 Aug 2019 20:19:23 +0200
Subject: [PATCH] configure.ac: fix --without-libdnet

Allow the user to disable libdnet check through --without-libdnet.
This option is useful to cross-compile tcpreplay to avoid build failures
if libdnet is installed on host but not on target, see
https://bugs.buildroot.org/show_bug.cgi?id=12096

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Upstream status: https://github.com/appneta/tcpreplay/pull/567]
---
 configure.ac | 48 +++++++++++++++++++++++++-----------------------
 1 file changed, 25 insertions(+), 23 deletions(-)

diff --git a/configure.ac b/configure.ac
index 39ba58b7..5de3dcb5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1464,30 +1464,32 @@ if test $have_cygwin = no ; then
         AC_HELP_STRING([--with-libdnet=DIR], [Use libdnet in DIR]),
         [trydnetdir=$withval])
 
-    case "$build_os" in
-    linux*)
-        dnl # Debian/Ubuntu already have a package called libdnet
-        dnl # so you the package you want to install libdumbnet-dev
-        for testdir in $trydnetdir /usr/local /opt/local /usr ; do
-            if test -x ${testdir}/bin/dumbnet-config -a $founddnet = no ; then
-                LDNETINC="$($testdir/bin/dumbnet-config --cflags)"
-                LDNETLIB="$($testdir/bin/dumbnet-config --libs)"
-                libdnet_version="$($testdir/bin/dumbnet-config --version) (libdumbnet)"
-                founddnet=$testdir
-            fi
-        done
-        ;;
-    esac
+    if test $trydnetdir != no; then
+        case "$build_os" in
+        linux*)
+            dnl # Debian/Ubuntu already have a package called libdnet
+            dnl # so you the package you want to install libdumbnet-dev
+            for testdir in $trydnetdir /usr/local /opt/local /usr ; do
+                if test -x ${testdir}/bin/dumbnet-config -a $founddnet = no ; then
+                    LDNETINC="$($testdir/bin/dumbnet-config --cflags)"
+                    LDNETLIB="$($testdir/bin/dumbnet-config --libs)"
+                    libdnet_version="$($testdir/bin/dumbnet-config --version) (libdumbnet)"
+                    founddnet=$testdir
+                fi
+            done
+            ;;
+        esac
 
-    if test $founddnet = no ; then
-        for testdir in $trydnetdir /usr/local /opt/local $MACOSX_SDK_PATH/usr /usr ; do
-            if test -x ${testdir}/bin/dnet-config -a $founddnet = no ; then
-                LDNETINC="$($testdir/bin/dnet-config --cflags)"
-                LDNETLIB="$($testdir/bin/dnet-config --libs)"
-                libdnet_version="$($testdir/bin/dnet-config --version)"
-                founddnet=$testdir
-            fi
-        done
+        if test $founddnet = no ; then
+            for testdir in $trydnetdir /usr/local /opt/local $MACOSX_SDK_PATH/usr /usr ; do
+                if test -x ${testdir}/bin/dnet-config -a $founddnet = no ; then
+                    LDNETINC="$($testdir/bin/dnet-config --cflags)"
+                    LDNETLIB="$($testdir/bin/dnet-config --libs)"
+                    libdnet_version="$($testdir/bin/dnet-config --version)"
+                    founddnet=$testdir
+                fi
+            done
+        fi
     fi
 
     if test $founddnet = no ; then