need to setup extension dir to current build instead of defaulting to system
defaults (which may be different php version)
also use preprocessed PHP.INI from test framework

--- php-5.4.0alpha3/ext/pcntl/tests/pcntl_exec.phpt	2011-06-24 22:18:06.000000000 +0300
+++ php-5.4.0alpha3/ext/pcntl/tests/pcntl_exec.phpt	2011-08-22 09:36:01.105334996 +0300
@@ -8,7 +8,10 @@
 --FILE--
 <?php
 echo "ok\n";
-pcntl_exec(getenv("TEST_PHP_EXECUTABLE"));
+$php = getenv("TEST_PHP_EXECUTABLE");
+$extension_dir = ini_get("extension_dir");
+$inipath = php_ini_loaded_file();
+pcntl_exec($php, array("-n", "-d$extension_dir", "-c$inipath"));
 echo "nok\n";
 ?>
 --EXPECT--
--- php-5.4.0alpha3/ext/pcntl/tests/pcntl_exec_2.phpt~	2011-06-24 22:18:06.000000000 +0300
+++ php-5.4.0alpha3/ext/pcntl/tests/pcntl_exec_2.phpt	2011-08-22 19:57:12.780576314 +0300
@@ -14,7 +14,13 @@
 	exit;
 }
 echo "ok\n";
-pcntl_exec(getenv("TEST_PHP_EXECUTABLE"), array(__FILE__), array(
+
+$php = getenv("TEST_PHP_EXECUTABLE");
+$extension_dir = ini_get("extension_dir");
+$inipath = php_ini_loaded_file();
+$args = array("-n", "-d$extension_dir", "-c$inipath", __FILE__);
+
+pcntl_exec($php, $args, array(
 	b"PCNTL_EXEC_TEST_IS_CHILD" => b"1", 
 	b"FOO" => b"BAR",
 	1 => b"long")