diff --git a/lib/curl_config.h b/lib/curl_config.h
index d3d74dc..526bcf7 100644
--- a/lib/curl_config.h
+++ b/lib/curl_config.h
@@ -128,7 +128,10 @@
 #define HAVE_BORINGSSL 1
 
 /* Define to 1 if you have the clock_gettime function and monotonic timer. */
+#ifndef __APPLE__
+/* CLOCK_MONOTONIC is not defined in mac when building for the host. */
 #define HAVE_CLOCK_GETTIME_MONOTONIC 1
+#endif
 
 /* Define to 1 if you have the closesocket function. */
 /* #undef HAVE_CLOSESOCKET */
@@ -442,10 +445,14 @@
 #define HAVE_MEMORY_H 1
 
 /* Define to 1 if you have the memrchr function or macro. */
+#ifndef __APPLE__
 #define HAVE_MEMRCHR 1
+#endif
 
 /* Define to 1 if you have the MSG_NOSIGNAL flag. */
+#ifndef __APPLE__
 #define HAVE_MSG_NOSIGNAL 1
+#endif
 
 /* Define to 1 if you have the <netdb.h> header file. */
 #define HAVE_NETDB_H 1
@@ -858,7 +865,7 @@
 #define RETSIGTYPE void
 
 /* Define to the type qualifier of arg 5 for select. */
-#define SELECT_QUAL_ARG5 
+#define SELECT_QUAL_ARG5
 
 /* Define to the type of arg 1 for select. */
 #define SELECT_TYPE_ARG1 int
@@ -890,18 +897,9 @@
 /* Define to the function return type for send. */
 #define SEND_TYPE_RETV int
 
-/* The size of `long', as computed by sizeof. */
-#define SIZEOF_LONG 4
-
 /* The size of `long long', as computed by sizeof. */
 /* #undef SIZEOF_LONG_LONG */
 
-/* The size of `off_t', as computed by sizeof. */
-#define SIZEOF_OFF_T 8
-
-/* The size of `void*', as computed by sizeof. */
-#define SIZEOF_VOIDP 4
-
 /* Define to 1 if you have the ANSI C header files. */
 #define STDC_HEADERS 1