Update libcurl autoconf macros from upstream

1 files changed, 3 insertions, 2 deletions

diff --git a/m4/libcurl.m4 b/m4/libcurl.m4
index 01a0575c..d7d5a525 100644
--- a/m4/libcurl.m4
+++ b/m4/libcurl.m4
@@ -146,7 +146,7 @@ AC_DEFUN([LIBCURL_CHECK_CONFIG],
            _libcurl_save_libs=$LIBS
            LIBS="$LIBCURL $LIBS"
 
-           AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <curl/curl.h>],[
+           AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <curl/curl.h>]],[[
 /* Try and use a few common options to force a failure if we are
    missing symbols or can't link. */
 int x;
@@ -157,7 +157,8 @@ x=CURLOPT_FILE;
 x=CURLOPT_ERRORBUFFER;
 x=CURLOPT_STDERR;
 x=CURLOPT_VERBOSE;
-])],libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
+if (x) ;
+]])],libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
 
            CPPFLAGS=$_libcurl_save_cppflags
            LIBS=$_libcurl_save_libs