[gnome-clocks] Use LT_LIB_M

[Paolo Borelli <pborelli src gnome org>]

commit e6a157c0cc469aad05254aee0586a637acb73809
Author: Paolo Borelli <pborelli gnome org>
Date:   Sat Feb 6 10:16:43 2016 +0100

    Use LT_LIB_M

 Makefile.am  |    2 +-
 configure.ac |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index b7ce741..1998536 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -130,7 +130,7 @@ AM_CFLAGS = \
 gnome_clocks_LDFLAGS = -export-dynamic
 gnome_clocks_LDADD = \
        $(CLOCKS_LIBS) \
-       -lm
+       $(LIBM)
 
 EXTRA_DIST = \
        $(appdata_in_files) \
diff --git a/configure.ac b/configure.ac
index 7daefed..b9bd6dd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,6 +45,7 @@ AC_PATH_PROG(GLIB_COMPILE_RESOURCES, glib-compile-resources)
 GLIB_GSETTINGS
 
 LT_INIT([disable-static])
+LT_LIB_M
 
 PKG_PROG_PKG_CONFIG([0.22])