1dnl AX_POPT_CONST - check popt prototype 2AC_DEFUN([AX_POPT_CONST], 3[ 4AC_MSG_CHECKING([popt prototype]) 5SAVE_CXXFLAGS=$CXXFLAGS 6CXXFLAGS="-Werror $CXXFLAGS" 7AC_TRY_COMPILE([#include <popt.h>], 8[ 9int c; char **v; 10poptGetContext(0, c, v, 0, 0); 11], 12AC_MSG_RESULT([takes char **]);, 13AC_MSG_RESULT([takes const char **]); AC_DEFINE(CONST_POPT, 1, [whether popt prototype takes a const char **])) 14CXXFLAGS="$SAVE_CXXFLAGS" 15] 16) 17