silence autoconf warnings

build/config/ax_check_java.m4

@@ -93,10 +93,10 @@ dnl Check if extra inc is required
   CPPFLAGS="$CPPFLAGS -I$JAVA_HOME/$java_inc_dir"
   AC_LANG_SAVE
   AC_LANG_C
-  AC_COMPILE_IFELSE(
+  AC_COMPILE_IFELSE([
     AC_LANG_SOURCE(
       [[#include <jni.h>]]
-    ),
+    )],
     passed=`expr $passed + 1`,failed=`expr $failed + 1`
   )
   AC_LANG_RESTORE
@@ -110,10 +110,10 @@ dnl Check if extra inc is required
     CPPFLAGS="$CPPFLAGS -I$JAVA_HOME/$java_inc_dir -I$JAVA_HOME/$java_inc_dir/$java_extra_inc"
     AC_LANG_SAVE
     AC_LANG_C
-    AC_COMPILE_IFELSE(
+    AC_COMPILE_IFELSE([
       AC_LANG_SOURCE(
 	[[#include <jni.h>]]
-      ),
+      )],
       passed=`expr $passed + 1`,failed=`expr $failed + 1`
     )
     AC_LANG_RESTORE

build/config/libcurl.m4

@@ -137,7 +137,7 @@ 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;
@@ -148,7 +148,7 @@ x=CURLOPT_FILE;
 x=CURLOPT_ERRORBUFFER;
 x=CURLOPT_STDERR;
 x=CURLOPT_VERBOSE;
-]),libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
+])],libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
 
            CPPFLAGS=$_libcurl_save_cppflags
            LIBS=$_libcurl_save_libs

configure.in

@@ -171,7 +171,7 @@ AC_PROG_CXX
 #check if the g++ compiler works
 AC_CACHE_CHECK([whether the C++ compiler works], [ac_cv_sys_cxx_works], [
     AC_LANG_PUSH([C++])
-    AC_COMPILE_IFELSE([int main() { }], [ac_cv_sys_cxx_works=yes],
+    AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main() { }])], [ac_cv_sys_cxx_works=yes],
         [ac_cv_sys_cxx_works=no])
     AC_LANG_POP([C++])
     ])