https://bugs.gentoo.org/961078
--- a/configure.ac
+++ b/configure.ac
@@ -63,6 +63,8 @@ AC_DISABLE_STATIC
 AC_ENABLE_SHARED
 AC_PROG_LIBTOOL
 
+AC_CHECK_LIB([m], [powf])
+
 dnl intltool
 ALL_LINGUAS="da de en_GB es fi fr it ja nl nn pl pt_PT ru sl sv tr zh_CN zh_TW"
 AC_SUBST(ALL_LINGUAS)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,9 +4,10 @@ transform = s/_/-/g
 cairo_clock_LDFLAGS = -Wl,--export-dynamic
 
 cairo_clock_LDADD =	\
+	$(LIBM)		\
 	$(GLIB_LIBS)	\
 	$(GTK_LIBS)	\
-	$(GTK_DEP_LIBS)		 
+	$(GTK_DEP_LIBS)
 
 cairo_clock_CFLAGS =			\
 	-I$(top_srcdir)			\