--- gtkglarea-2.0.1/examples/Makefile.am~	2009-07-18 05:29:39.000000000 +0800
+++ gtkglarea-2.0.1/examples/Makefile.am	2012-12-25 17:19:33.586212733 +0800
@@ -9,7 +9,7 @@
 noinst_PROGRAMS = simple zktor viewlw glpixmap gdkfont $(shader_programs) gtkglarea_demo
 
 INCLUDES = -I$(top_srcdir)
-LDADD = $(top_builddir)/gtkgl/libgtkgl-2.0.la $(GTK_LIBS) $(GL_LIBS)
+LDADD = $(top_builddir)/gtkgl/libgtkgl-2.0.la $(GTK_LIBS) $(GL_LIBS) -lm
 
 simple_SOURCES   = simple.c
 zktor_SOURCES    = zktor.c
--- gtkglarea-2.0.1/configure.ac~	2009-07-18 18:02:36.000000000 +0800
+++ gtkglarea-2.0.1/configure.ac	2012-12-25 17:30:02.312645971 +0800
@@ -57,7 +57,7 @@
 dnl  Check for GTK libraries
 dnl
 GTK_REQUIRED_VERSION=2.0.0
-PKG_CHECK_MODULES(GTK, gtk+-2.0 >= $GTK_REQUIRED_VERSION gmodule-2.0 >= $GTK_REQUIRED_VERSION)
+PKG_CHECK_MODULES(GTK, gtk+-2.0 >= $GTK_REQUIRED_VERSION gmodule-2.0 >= $GTK_REQUIRED_VERSION x11)
 
 AC_SUBST(GTK_CFLAGS)
 AC_SUBST(GTK_LIBS)