--- a/liboctave/oct-types.h.in
+++ b/liboctave/oct-types.h.in
@@ -26,6 +26,49 @@
 
 typedef @OCTAVE_IDX_TYPE@ octave_idx_type;
 
+#if defined (HAVE_STDINT_H)
+#include <stdint.h>
+#elif defined (HAVE_INTTYPES_H)
+#include <inttypes.h>
+#else
+
+#if CHAR_BIT == 8
+typedef signed char int8_t;
+typedef unsigned char uint8_t;
+#else
+#error "CHAR_BIT is not 8!"
+#endif
+
+#if SIZEOF_SHORT == 2
+typedef short int16_t;
+typedef unsigned short uint16_t;
+#elif SIZEOF_INT == 2
+typedef long int16_t;
+typedef unsigned long uint16_t;
+#else
+#error "No 2 byte integer type found!"
+#endif
+
+#if SIZEOF_INT == 4
+typedef int int32_t;
+typedef unsigned int uint32_t;
+#elif SIZEOF_LONG == 4
+typedef long int32_t;
+typedef unsigned long uint32_t;
+#else
+#error "No 4 byte integer type found!"
+#endif
+
+#if SIZEOF_LONG == 8
+typedef long int64_t;
+typedef unsigned long uint64_t;
+#elif SIZEOF_LONG_LONG == 8
+typedef long long int64_t;
+typedef unsigned long long uint64_t;
+#endif
+
+#endif
+
 #endif
 
 /*