diff --git a/configure b/configure
index d849c7a..fed97e2 100755
--- a/configure
+++ b/configure
@@ -12180,7 +12180,7 @@ case "$host" in
   i?86-*-freebsd* | i?86-*-openbsd*)
 	TARGET=X86_FREEBSD; TARGETDIR=x86
 	;;
-  i?86-win32* | i?86-*-cygwin* | i?86-*-mingw*)
+  i?86-win32* | i?86-*-cygwin* | i?86-*-mingw* | i?86-*-interix*)
 	TARGET=X86_WIN32; TARGETDIR=x86
 	# All mingw/cygwin/win32 builds require this for sharedlib
 	AM_LTLDFLAGS="-no-undefined"
diff --git a/configure.ac b/configure.ac
index 6314a6a..4e178a2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,7 +80,7 @@ case "$host" in
   i?86-*-freebsd* | i?86-*-openbsd*)
 	TARGET=X86_FREEBSD; TARGETDIR=x86
 	;;
-  i?86-win32* | i?86-*-cygwin* | i?86-*-mingw*)
+  i?86-win32* | i?86-*-cygwin* | i?86-*-mingw* | i?86-*-interix*)
 	TARGET=X86_WIN32; TARGETDIR=x86
 	# All mingw/cygwin/win32 builds require this for sharedlib
 	AM_LTLDFLAGS="-no-undefined"
diff --git a/src/closures.c b/src/closures.c
index bc087d9..65bf6a9 100644
--- a/src/closures.c
+++ b/src/closures.c
@@ -193,11 +193,11 @@ static int dlmalloc_trim(size_t) MAYBE_UNUSED;
 static size_t dlmalloc_usable_size(void*) MAYBE_UNUSED;
 static void dlmalloc_stats(void) MAYBE_UNUSED;
 
-#if !(defined(X86_WIN32) || defined(X86_WIN64)) || defined (__CYGWIN__)
+#if !(defined(X86_WIN32) || defined(X86_WIN64)) || defined (__CYGWIN__) || defined(__INTERIX)
 /* Use these for mmap and munmap within dlmalloc.c.  */
 static void *dlmmap(void *, size_t, int, int, int, off_t);
 static int dlmunmap(void *, size_t);
-#endif /* !(defined(X86_WIN32) || defined(X86_WIN64)) || defined (__CYGWIN__) */
+#endif /* !(defined(X86_WIN32) || defined(X86_WIN64)) || defined (__CYGWIN__) || defined(__INTERIX) */
 
 #define mmap dlmmap
 #define munmap dlmunmap
@@ -207,7 +207,7 @@ static int dlmunmap(void *, size_t);
 #undef mmap
 #undef munmap
 
-#if !(defined(X86_WIN32) || defined(X86_WIN64)) || defined (__CYGWIN__)
+#if !(defined(X86_WIN32) || defined(X86_WIN64)) || defined (__CYGWIN__) || defined(__INTERIX)
 
 #if FFI_MMAP_EXEC_SELINUX
 
@@ -545,7 +545,7 @@ segment_holding_code (mstate m, char* addr)
 }
 #endif
 
-#endif /* !(defined(X86_WIN32) || defined(X86_WIN64)) || defined (__CYGWIN__) */
+#endif /* !(defined(X86_WIN32) || defined(X86_WIN64)) || defined (__CYGWIN__) || defined(__INTERIX) */
 
 /* Allocate a chunk of memory with the given size.  Returns a pointer
    to the writable address, and sets *CODE to the executable