From 89658b3c5c2493428678622b35004540ae7f8e68 Mon Sep 17 00:00:00 2001
From: Radek Krejci <rkrejci@cesnet.cz>
Date: Mon, 8 Feb 2016 11:14:46 +0100
Subject: [PATCH] build BUGFIX add missing math library to link with

Relates to #17
---
 CMakeLists.txt | 3 +++
 src/xpath.c    | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1dd7bef1d..21206d442 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,6 +83,9 @@ set(headers
 add_library(yang SHARED ${libsrc})
 set_target_properties(yang PROPERTIES VERSION ${LIBYANG_VERSION} SOVERSION ${LIBYANG_SOVERSION})
 
+# link math
+target_link_libraries(yang m)
+
 # find pthreads
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
 find_package(Threads REQUIRED)
diff --git a/src/xpath.c b/src/xpath.c
index b4997fcb0..49885e059 100644
--- a/src/xpath.c
+++ b/src/xpath.c
@@ -21,6 +21,9 @@
 
 #define _GNU_SOURCE
 
+/* needed by libmath functions isfinite(), isinf(), isnan(), signbit(), ... */
+#define _ISOC99_SOURCE
+
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>