AC_CHECK_HEADERS([geos_c.h],, [AC_MSG_ERROR([could not find geos_c.h - you may need to specify the directory of a geos-config file using --with-geosconfig])])
CPPFLAGS="$CPPFLAGS_SAVE"
# Ensure we can link against libgeos_c
+ if 0; then
LIBS_SAVE="$LIBS"
LIBS="$GEOS_LDFLAGS"
AC_SEARCH_LIBS(GEOSCoveredBy,geos_c,,AC_MSG_ERROR([could not find libgeos_c (or obsolete 'libgeos_c' < v.3.3.0 found) - you may need to specify the directory of a geos-config file using --with-geosconfig]))