AC_EGREP_HEADER([CURLOPT_SSL_CTX_FUNCTION], [curl/curl.h],
[AC_MSG_RESULT(yes)],
[AC_MSG_ERROR([need libcurl that supports CURLOPT_SSL_CTX_FUNCTION])])
+ AC_CHECK_TYPE([curl_off_t],[AC_DEFINE([HAVE_CURL_OFF_T], [1], [Define to 1 if you have the 'curl_off_t' type.])])
# restore master libs
LIBS="$save_LIBS"