diff -Naur gdl-0.9rc3/configure.in gdl-0.9rc3.new/configure.in
--- gdl-0.9rc3/configure.in	2009-09-11 12:04:15.000000000 -0400
+++ gdl-0.9rc3.new/configure.in	2010-01-11 22:40:55.000000000 -0500
@@ -534,20 +534,20 @@
 
 if test "x$with_libproj4" != "xno"; then
   if test "x$with_libproj4" != "xyes"; then
-    LIBS="$LIBS -L$with_libproj4/lib -lproj4"
+    LIBS="$LIBS -L$with_libproj4/lib -lproj"
     INCLUDES="$INCLUDES -I$with_libproj4/include"
   else
     INCLUDES="$INCLUDES -I/usr/include"
-    LIBS="$LIBS -lproj4"
+    LIBS="$LIBS -lproj"
   fi
 
-  AC_CHECK_LIB(proj4, proj_init, [AC_DEFINE([USE_LIBPROJ4], [1], 
+  AC_CHECK_LIB(proj, proj_init, [AC_DEFINE([USE_LIBPROJ4], [1], 
   [Define if you want to use LIBPROJ4])], [])
 
-  AC_CHECK_LIB(proj4, proj_init, [AC_DEFINE([USE_LIBPROJ4_NEW], [1], 
+  AC_CHECK_LIB(proj, proj_init, [AC_DEFINE([USE_LIBPROJ4_NEW], [1], 
   [Define if you want to use new LIBPROJ4])], [
 
-     AC_CHECK_LIB(proj4, pj_init, [AC_DEFINE([USE_LIBPROJ4], [1], 
+     AC_CHECK_LIB(proj, pj_init, [AC_DEFINE([USE_LIBPROJ4], [1], 
      [Define if you want to use LIBPROJ4])], [
        echo ""
        echo "Error! LIBPROJ4 is required but was not found"
diff -Naur gdl-0.9rc3/src/math_utl.hpp gdl-0.9rc3.new/src/math_utl.hpp
--- gdl-0.9rc3/src/math_utl.hpp	2009-09-11 12:04:10.000000000 -0400
+++ gdl-0.9rc3.new/src/math_utl.hpp	2010-01-11 22:37:48.000000000 -0500
@@ -58,7 +58,7 @@
 #endif
 
 extern "C" {
-#include "lib_proj.h"
+#include <projects.h>
 }
 
   PROJTYPE *map_init();
diff -Naur gdl-0.9rc3/src/math_utl.hpp.orig gdl-0.9rc3.new/src/math_utl.hpp.orig
--- gdl-0.9rc3/src/math_utl.hpp.orig	1969-12-31 19:00:00.000000000 -0500
+++ gdl-0.9rc3.new/src/math_utl.hpp.orig	2009-09-11 12:04:10.000000000 -0400
@@ -0,0 +1,73 @@
+/***************************************************************************
+                        math_utl.hpp  -  math utilities GDL library function
+                             -------------------
+    begin                : Feb 11 2004
+    copyright            : (C) 2004 by Joel Gales
+    email                : jomoga@users.sourceforge.net
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef MATH_UTL_HPP_
+#define MATH_UTL_HPP_
+
+#include "basegdl.hpp"
+
+//#define ABS(xxx) (( xxx > -xxx)?(xxx):(-xxx))
+
+template< typename T>
+inline T abs( T a) { return (a>=T(0))?a:-a;}
+
+namespace lib {
+
+//   int trans513(char *, int, int, int, DType);
+//   int transpose(char *, SizeT, SizeT [], SizeT, DType);
+//   int transpose_perm(char *, SizeT, SizeT [], SizeT, DType, long []);
+
+  void machar_s ( long int *ibeta, long int *it, long int *irnd, long int *ngrd,
+		  long int *machep, long int *negep, long int *iexp, long int *minexp,
+		  long int *maxexp, float *eps, float *epsneg, float *xmin, float *xmax );
+  void machar_d ( long int *ibeta, long int *it, long int *irnd, long int *ngrd,
+		  long int *machep, long int *negep, long int *iexp, long int *minexp,
+		  long int *maxexp, double *eps, double *epsneg, double *xmin, double *xmax );
+
+#ifdef USE_LIBPROJ4
+#define COMPLEX COMPLEX2
+
+#ifdef USE_LIBPROJ4_NEW
+#define PROJTYPE PROJ
+#define LPTYPE PROJ_LP
+#define XYTYPE PROJ_XY
+#define PJ_INIT proj_init
+#define PJ_FWD proj_fwd
+#define PJ_INV proj_inv
+#else
+#define PROJTYPE PJ
+#define LPTYPE LP
+#define XYTYPE XY
+#define PJ_INIT pj_init
+#define PJ_FWD pj_fwd
+#define PJ_INV pj_inv
+#endif
+
+extern "C" {
+#include "lib_proj.h"
+}
+
+  PROJTYPE *map_init();
+  static PROJTYPE *ref;
+  static PROJTYPE *prev_ref;
+
+#define COMPLEX2 COMPLEX
+#endif
+
+} // namespace
+
+#endif