diff --git a/libc/include/inttypes.h b/libc/include/inttypes.h
new file mode 100644
index 00000000..f79c477e
--- /dev/null
+++ b/libc/include/inttypes.h
@@ -0,0 +1,73 @@
+/* inttypes.h: Integer format specifiers for use in printf() and scanf(). */
+
+#ifndef _INTTYPES_H
+#define _INTTYPES_H
+
+#include <stdint.h>
+
+#define __PRI64_PREFIX "l"
+
+#define PRId8 "d"
+#define PRId16 "d"
+#define PRId32 "d"
+#define PRId64 __PRI64_PREFIX "d"
+#define PRIdLEAST8 "d"
+#define PRIdLEAST16 "d"
+#define PRIdLEAST32 "d"
+#define PRIdLEAST64 __PRI64_PREFIX "d"
+#define PRIdFAST8 "d"
+#define PRIdFAST16 "d"
+#define PRIdFAST32 "d"
+#define PRIdFAST64 __PRI64_PREFIX "d"
+#define PRIdMAX __PRI64_PREFIX "d"
+#define PRIdPTR __PRI64_PREFIX "d"
+#define PRIi8 "d"
+#define PRIi16 "d"
+#define PRIi32 "d"
+#define PRIi64 __PRI64_PREFIX "d"
+#define PRIiLEAST8 "d"
+#define PRIiLEAST16 "d"
+#define PRIiLEAST32 "d"
+#define PRIiLEAST64 __PRI64_PREFIX "d"
+#define PRIiFAST8 "d"
+#define PRIiFAST16 "d"
+#define PRIiFAST32 "d"
+#define PRIiFAST64 __PRI64_PREFIX "d"
+#define PRIiMAX __PRI64_PREFIX "d"
+#define PRIiPTR __PRI64_PREFIX "d"
+#define PRIu8 "u"
+#define PRIu16 "u"
+#define PRIu32 "u"
+#define PRIu64 __PRI64_PREFIX "u"
+#define PRIuLEAST8 "u"
+#define PRIuLEAST16 "u"
+#define PRIuLEAST32 "u"
+#define PRIuLEAST64 __PRI64_PREFIX "u"
+#define PRIuFAST8 "u"
+#define PRIuFAST16 "u"
+#define PRIuFAST32 "u"
+#define PRIuFAST64 __PRI64_PREFIX "u"
+#define PRIuMAX __PRI64_PREFIX "u"
+#define PRIuPTR __PRI64_PREFIX "u"
+#define PRIx8 "x"
+#define PRIx16 "x"
+#define PRIx32 "x"
+#define PRIx64 __PRI64_PREFIX "x"
+#define PRIxLEAST8 "x"
+#define PRIxLEAST16 "x"
+#define PRIxLEAST32 "x"
+#define PRIxLEAST64 __PRI64_PREFIX "x"
+#define PRIxFAST8 "x"
+#define PRIxFAST16 "x"
+#define PRIxFAST32 "x"
+#define PRIxFAST64 __PRI64_PREFIX "x"
+#define PRIxMAX __PRI64_PREFIX "x"
+#define PRIxPTR __PRI64_PREFIX "x"
+#define PRIX8 PRIx8
+#define PRIX16 PRIx16
+#define PRIX32 PRIx32
+#define PRIX64 PRIx64
+#define PRIXMAX PRIxMAX
+#define PRIXPTR PRIxPTR
+
+#endif
diff --git a/libc/include/signal.h b/libc/include/signal.h
new file mode 100644
index 00000000..0b0b6bf2
--- /dev/null
+++ b/libc/include/signal.h
@@ -0,0 +1,8 @@
+/* signal.h: Signal management. */
+
+#ifndef _SIGNAL_H
+#define _SIGNAL_H
+
+typedef int sig_atomic_t;
+
+#endif