--- a/configure.ac
+++ b/configure.ac
@@ -178,6 +178,8 @@
  echo "Looking for gtk2"
 
 PKG_CHECK_MODULES(GTK, [gtk+-2.0 >= 2.6.0])
+AC_CHECK_LIB(m,sqrt)
+PKG_CHECK_MODULES(GMODULE, [gmodule-2.0 >= 2.0])
 
 AC_SUBST(GTK_CFLAGS)
 AC_SUBST(GTK_LIBS)

--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,7 +4,6 @@
 libggobi_la_GOBHEADERS = $(libggobi_la_GOBS:%.gob=ggobi-%.h)
 libggobi_la_GOBOBJECTS = $(libggobi_la_GOBS:%.gob=ggobi-%.lo)
 libggobi_la_GOBSTAMPS = $(libggobi_la_GOBS:%.gob=.%.gob.stamp)
-libggobi_la_LDFLAGS  = @GTK_LIBS@ @LIBXML_LIBS@
 libggobi_la_BUILT = array.c ash1d.c barchart.c barchartClass.c \
   barchart_ui.c brush.c brush_api.c brush_bins.c brush_init.c brush_link.c \
   brush_ui.c color.c color_ui.c cpanel.c display.c display_tree.c display_ui.c \
@@ -27,7 +26,7 @@
   write_csv.c write_xml.c wvis.c wvis_ui.c xlines.c xyplot.c \
   xyplot_ui.c $(libggobi_la_GOBSOURCES)
 libggobi_la_SOURCES = $(libggobi_la_BUILT) $(libggobi_la_GOBSTAMPS)
-libggobi_la_LIBADD = $(libggobi_la_GOBOBJECTS)
+libggobi_la_LIBADD = $(libggobi_la_GOBOBJECTS) @GTK_LIBS@ @LIBXML_LIBS@ @GMODULE_LIBS@
 libggobi_la_DEPENDENCIES = $(libggobi_la_GOBOBJECTS)
 pkginclude_HEADERS = GGobiAPI.h ggobiClass.h tour1d_pp.h GGobiApp.h \
   noop-toggle.h tour2d_pp.h GGobiEvents.h parcoordsClass.h tour_pp.h \
@@ -59,7 +58,7 @@
 # Windows specific
 if OS_WIN32
 libggobi_la_DEPENDENCIES+=libggobi.def
-libggobi_la_LDFLAGS+=-Wc,-s -no-undefined -export-symbols libggobi.def
+libggobi_la_LDFLAGS=-Wc,-s -no-undefined -export-symbols libggobi.def
 ggobi_LDFLAGS = -mwindows -s
 endif
 
--- a/plugins/GraphLayout/configure.ac
+++ b/plugins/GraphLayout/configure.ac
@@ -44,6 +44,7 @@
 AC_MSG_RESULT(no)])
 
 AC_MSG_CHECKING([whether Graphviz API is based on cgraph])
+save_CFLAGS="${CFLAGS}"
 CFLAGS=$LIBGVC_CFLAGS
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
    #include <gvc.h>
@@ -53,8 +54,10 @@
      return 0;
    }
 ])], graphviz_new_api=yes, graphviz_new_api=no)
+CFLAGS="${save_CFLAGS}"
 AC_MSG_RESULT($graphviz_new_api)
 if test "$graphviz_new_api" = "yes"; then
+  CFLAGS="${CFLAGS} ${LIBGVC_CFLAGS}"
   AC_DEFINE(HAVE_CGRAPH,[1],[define for cgraph-based graphviz])
 fi