Copied the NO_UNDEFINED magic from libcurl to make this build fine again with
libtool cross-compiled on linux with mingw32
diff --git a/ares/Makefile.am b/ares/Makefile.am
index 9983941..8718f55 100644
--- a/ares/Makefile.am
+++ b/ares/Makefile.am
@@ -43,7 +43,13 @@
# set age to 0. (c:r:a=0)
#
-libcares_la_LDFLAGS = $(VER)
+if NO_UNDEFINED
+# The -no-undefined flag is crucial for this to build fine on some platforms
+UNDEF = -no-undefined
+endif
+
+
+libcares_la_LDFLAGS = $(UNDEF) $(VER)
# Makefile.inc provides the CSOURCES and HHEADERS defines
include Makefile.inc
diff --git a/ares/configure.ac b/ares/configure.ac
index f862f8b..8f903a3 100644
--- a/ares/configure.ac
+++ b/ares/configure.ac
@@ -69,6 +69,18 @@
CARES_CLEAR_LIBTOOL_TAGS
AC_PROG_LIBTOOL
+AC_MSG_CHECKING([if we need -no-undefined])
+case $host in
+ *-*-cygwin | *-*-mingw* | *-*-pw32*)
+ need_no_undefined=yes
+ ;;
+ *)
+ need_no_undefined=no
+ ;;
+esac
+AC_MSG_RESULT($need_no_undefined)
+AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes)
+
dnl Checks for header files.
AC_HEADER_STDC
