Use AC_SEARCH_LIBS instead of AC_CHECK_LIB for checking GDAL libraries

git-svn-id: http://svn.osgeo.org/postgis/trunk@9499 b70326c6-7e19-0410-871a-916f4a2858ee

configure.ac

@@ -989,14 +989,14 @@ if test "x$with_raster" != "xno"; then
 			[AC_MSG_ERROR([could not find headers include related to gdal])])
 
 		dnl Ensure we can link against gdal
-		AC_CHECK_LIB([gdal], [GDALAllRegister], [], [AC_MSG_ERROR([could not find gdal])], [])
+		AC_SEARCH_LIBS([GDALAllRegister], [gdal], [], [AC_MSG_ERROR([could not find gdal])], [])
 
 		LIBS="$LIBGDAL_LDFLAGS"
 
 		dnl Check if the new polygonize function is present
-		AC_CHECK_LIB(
-			[gdal],
+		AC_SEARCH_LIBS(
 			[GDALFPolygonize],
+			[gdal],
 			[AC_DEFINE_UNQUOTED([GDALFPOLYGONIZE], [1], [Define to 1 if GDALFPolygonize function is available])],
 			[])