--- configure.in.link	2013-06-03 11:56:15.902704043 +0800
+++ configure.in	2013-06-03 12:00:13.739048287 +0800
@@ -5,8 +5,7 @@
 
 AM_INIT_AUTOMAKE(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)
 
-PKG_CHECK_MODULES(CHBG, gtk+-2.0)
-PKG_CHECK_MODULES(CHBG, atk)
+PKG_CHECK_MODULES(CHBG, gtk+-2.0 atk x11)
 
 AC_SUBST(CHBG_CFLAGS)
 AC_SUBST(CHBG_LIBS)
@@ -97,9 +96,10 @@
 
 AC_CHECK_LIB(z, inflate, Z_LIBS="-lz")
 AC_CHECK_LIB(png, png_write_info, PNG_LIBS="-lpng", , $Z_LIBS)
+AC_CHECK_LIB(m, floor, MATH_LIBS="-lm")
 
 CHBG_CFLAGS="$CHBG_CFLAGS $IMLIB_CFLAGS $INTL_CFLAGS -DDEFAULT_SYS_CHBG_RC=\"\\\"\$(sysconfdir)/chbgrc\\\"\""
-LIBS="$LDFLAGS $IMLIB_LIBS $INTL_LIBS $PNG_LIBS $Z_LIBS $CHBG_LIBS"
+LIBS="$IMLIB_LIBS $INTL_LIBS $PNG_LIBS $Z_LIBS $CHBG_LIBS $MATH_LIBS"
 
 if eval "test x$WITH_ETERM = xyes";then
 	CHBG_CFLAGS="-DHAVE_ESETROOT_SUPPORT $CHBG_CFLAGS"