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-rw-r--r--src/external/libcares.m420
1 files changed, 20 insertions, 0 deletions
diff --git a/src/external/libcares.m4 b/src/external/libcares.m4
new file mode 100644
index 000000000..657deac59
--- /dev/null
+++ b/src/external/libcares.m4
@@ -0,0 +1,20 @@
+AC_SUBST(CARES_OBJ)
+AC_SUBST(CARES_LIBS)
+AC_SUBST(CARES_CFLAGS)
+
+AC_CHECK_HEADERS(ares.h,
+ [AC_CHECK_LIB([cares], [ares_init], [ CARES_LIBS="-lcares" ], [AC_MSG_ERROR([No usable c-ares library found])])],
+ [AC_MSG_ERROR([c-ares header files are not installed])]
+)
+
+dnl Check if this particular version of c-ares supports the generic ares_free_data function
+AC_CHECK_LIB([cares],
+ [ares_free_data],
+ [AC_DEFINE([HAVE_ARES_DATA], 1, [Does c-ares have ares_free_data()?])
+ ],
+ [
+ ares_data=1
+ ]
+)
+
+AM_CONDITIONAL(BUILD_ARES_DATA, test x$ares_data = x1)