POPT_OBJ="" AC_SUBST(POPT_OBJ) AC_SUBST(POPT_LIBS) AC_SUBST(POPT_CFLAGS) AC_CHECK_HEADERS([popt.h], [AC_CHECK_LIB(popt, poptGetContext, [ POPT_LIBS="-lpopt" ], [AC_MSG_ERROR([POPT must support poptGetContext])])], [AC_MSG_ERROR([POPT development libraries not installed])] )