diff --git a/libflashrom.c b/libflashrom.c
index 1d8a9ae..0dec22e 100644
--- a/libflashrom.c
+++ b/libflashrom.c
@@ -170,6 +170,7 @@
  */
 struct flashrom_board_info *flashrom_supported_boards(void)
 {
+#if CONFIG_INTERNAL == 1
 	int boards_known_size = 0;
 	int i = 0;
 	const struct board_info *binfo = boards_known;
@@ -194,6 +195,9 @@
 	}
 
 	return supported_boards;
+#else
+	return NULL;
+#endif
 }
 
 /**
@@ -202,6 +206,7 @@
  */
 struct flashrom_chipset_info *flashrom_supported_chipsets(void)
 {
+#if CONFIG_INTERNAL == 1
 	int chipset_enables_size = 0;
 	int i = 0;
 	const struct penable *chipset = chipset_enables;
@@ -228,6 +233,9 @@
 	}
 
 	return supported_chipsets;
+#else
+	return NULL;
+#endif
 }
 
 /**
diff --git a/physmap.c b/physmap.c
index ad38ad3..72d5899 100644
--- a/physmap.c
+++ b/physmap.c
@@ -363,6 +363,7 @@
 	return physmap_common(descr, phys_addr, len, PHYSM_RO, PHYSM_NOCLEANUP, PHYSM_EXACT);
 }
 
+#if CONFIG_INTERNAL == 1
 /* MSR abstraction implementations for Linux, OpenBSD, FreeBSD/Dragonfly, OSX, libpayload
  * and a non-working default implementation on the bottom. See also hwaccess.h for some (re)declarations. */
 #if defined(__i386__) || defined(__x86_64__)
@@ -687,3 +688,4 @@
 #else // x86
 /* Does MSR exist on non-x86 architectures? */
 #endif // arch switches for MSR code
+#endif // CONFIG_INTERNAL == 1