diff --git a/ChangeLog b/ChangeLog
index 3508adc1c8..6363abc0b4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2007-07-23  Stefan Kost  <ensonic@users.sf.net>
+
+	* configure.ac:
+	  Sync liboil check with plugins-base. Add libm check.
+
+	* gst/synaesthesia/Makefile.am:
+	  Link against libm. We're using sqrt here.
+
 2007-07-20  Stefan Kost  <ensonic@users.sf.net>
 
 	* gst/asfdemux/gstasfdemux.c:
diff --git a/configure.ac b/configure.ac
index 964be365e4..9f8ae9314d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,6 +8,7 @@ dnl use a three digit version number for releases, and four for cvs/prerelease
 AC_INIT(GStreamer Ugly Plug-ins, 0.10.6.1,
     http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer,
     gst-plugins-ugly)
+
 AG_GST_INIT
 
 dnl initialize automake
@@ -156,9 +157,14 @@ AM_CONDITIONAL(HAVE_VALGRIND, test ! "x$VALGRIND_PATH" = "xno")
 dnl check for documentation tools
 GTK_DOC_CHECK([1.3])
 AS_PATH_PYTHON([2.1])
+AG_GST_PLUGIN_DOCS([1.3],[2.1])
 
 dnl *** checks for libraries ***
 
+dnl check for libm, for sin()
+AC_CHECK_LIBM
+AC_SUBST(LIBM)
+
 dnl *** checks for header files ***
 
 dnl used by ext/a52dec
@@ -184,10 +190,10 @@ dnl GLib is required
 AG_GST_GLIB_CHECK([2.6])
 
 dnl liboil is required
-PKG_CHECK_MODULES(LIBOIL, liboil-0.3 >= 0.3.6, HAVE_LIBOIL=yes, HAVE_LIBOIL=no)
+PKG_CHECK_MODULES(LIBOIL, liboil-0.3 >= 0.3.8, HAVE_LIBOIL=yes, HAVE_LIBOIL=no)
 if test "x$HAVE_LIBOIL" != "xyes"
 then
-  AC_ERROR([liboil-0.3.6 or later is required])
+  AC_ERROR([liboil-0.3.8 or later is required])
 fi
 
 dnl checks for gstreamer
diff --git a/gst/synaesthesia/Makefile.am b/gst/synaesthesia/Makefile.am
index aa84df69aa..56d3d97470 100644
--- a/gst/synaesthesia/Makefile.am
+++ b/gst/synaesthesia/Makefile.am
@@ -5,7 +5,7 @@ libgstsynaesthesia_la_SOURCES = gstsynaesthesia.c synaescope.c
 noinst_HEADERS = synaescope.h gstsynaesthesia.h
 
 libgstsynaesthesia_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS)
-libgstsynaesthesia_la_LIBADD = $(GST_BASE_LIBS) $(GST_LIBS)
+libgstsynaesthesia_la_LIBADD = $(GST_BASE_LIBS) $(GST_LIBS) $(LIBM)
 libgstsynaesthesia_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 
 EXTRA_DIST = README