diff -ru a/Zend/configure.in b/Zend/configure.in
--- a/Zend/configure.in	2018-11-07 15:35:26.000000000 +0000
+++ b/Zend/configure.in	2018-11-27 00:28:48.000000000 +0000
@@ -70,7 +70,7 @@
 #endif
 
 #ifndef zend_isnan
-#if HAVE_DECL_ISNAN && (!defined(__cplusplus) || __cplusplus < 201103L)
+#if HAVE_DECL_ISNAN && (defined(__APPLE__) || defined(__APPLE_CC__) || !defined(__cplusplus) || __cplusplus < 201103L)
 #define zend_isnan(a) isnan(a)
 #elif defined(HAVE_FPCLASS)
 #define zend_isnan(a) ((fpclass(a) == FP_SNAN) || (fpclass(a) == FP_QNAN))
@@ -79,7 +79,7 @@
 #endif
 #endif
 
-#if HAVE_DECL_ISINF && (!defined(__cplusplus) || __cplusplus < 201103L)
+#if HAVE_DECL_ISINF && (defined(__APPLE__) || defined(__APPLE_CC__) || !defined(__cplusplus) || __cplusplus < 201103L)
 #define zend_isinf(a) isinf(a)
 #elif defined(INFINITY)
 /* Might not work, but is required by ISO C99 */
@@ -90,7 +90,7 @@
 #define zend_isinf(a) 0
 #endif
 
-#if HAVE_DECL_ISFINITE && (!defined(__cplusplus) || __cplusplus < 201103L)
+#if HAVE_DECL_ISFINITE && (defined(__APPLE__) || defined(__APPLE_CC__) || !defined(__cplusplus) || __cplusplus < 201103L)
 #define zend_finite(a) isfinite(a)
 #elif defined(HAVE_FINITE)
 #define zend_finite(a) finite(a)
diff -ru a/configure.in b/configure.in
--- a/configure.in	2018-11-07 15:35:26.000000000 +0000
+++ b/configure.in	2018-11-27 00:28:48.000000000 +0000
@@ -75,7 +75,7 @@
 #endif
 
 #ifndef zend_isnan
-#if HAVE_DECL_ISNAN && (!defined(__cplusplus) || __cplusplus < 201103L)
+#if HAVE_DECL_ISNAN && (defined(__APPLE__) || defined(__APPLE_CC__) || !defined(__cplusplus) || __cplusplus < 201103L)
 #define zend_isnan(a) isnan(a)
 #elif defined(HAVE_FPCLASS)
 #define zend_isnan(a) ((fpclass(a) == FP_SNAN) || (fpclass(a) == FP_QNAN))
@@ -84,7 +84,7 @@
 #endif
 #endif
 
-#if HAVE_DECL_ISINF && (!defined(__cplusplus) || __cplusplus < 201103L)
+#if HAVE_DECL_ISINF && (defined(__APPLE__) || defined(__APPLE_CC__) || !defined(__cplusplus) || __cplusplus < 201103L)
 #define zend_isinf(a) isinf(a)
 #elif defined(INFINITY)
 /* Might not work, but is required by ISO C99 */
@@ -95,7 +95,7 @@
 #define zend_isinf(a) 0
 #endif
 
-#if HAVE_DECL_ISFINITE && (!defined(__cplusplus) || __cplusplus < 201103L)
+#if HAVE_DECL_ISFINITE && (defined(__APPLE__) || defined(__APPLE_CC__) || !defined(__cplusplus) || __cplusplus < 201103L)
 #define zend_finite(a) isfinite(a)
 #elif defined(HAVE_FINITE)
 #define zend_finite(a) finite(a)