diff --git a/MultiSource/Applications/oggenc/oggenc.c b/MultiSource/Applications/oggenc/oggenc.c
--- a/MultiSource/Applications/oggenc/oggenc.c
+++ b/MultiSource/Applications/oggenc/oggenc.c
@@ -8,7 +8,9 @@
  * Portions from Vorbize, (c) Kenneth Arnold <kcarnold@yahoo.com>
  * and libvorbis examples, (c) Monty <monty@xiph.org>
  */
+#if __has_include(<alloca.h>)
 #include <alloca.h>
+#endif
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
diff --git a/MultiSource/Benchmarks/MiBench/consumer-lame/rtp.c b/MultiSource/Benchmarks/MiBench/consumer-lame/rtp.c
--- a/MultiSource/Benchmarks/MiBench/consumer-lame/rtp.c
+++ b/MultiSource/Benchmarks/MiBench/consumer-lame/rtp.c
@@ -4,7 +4,9 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>
+#if __has_include(<alloca.h>)
 #include <alloca.h>
+#endif
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>