diff --git a/lang/cem/cpp.ansi/ch3bin.h b/lang/cem/cpp.ansi/ch3bin.h
new file mode 100644
index 000000000..ba84e0937
--- /dev/null
+++ b/lang/cem/cpp.ansi/ch3bin.h
@@ -0,0 +1,15 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef CH3BIN_H_
+#define CH3BIN_H_
+
+#include "arith.h"
+
+void ch3bin(register arith *pval, int *pis_uns, int oper, register arith val, int is_uns);
+
+#endif /* CH3BIN_H_ */
diff --git a/lang/cem/cpp.ansi/ch3mon.h b/lang/cem/cpp.ansi/ch3mon.h
new file mode 100644
index 000000000..fd715c4a3
--- /dev/null
+++ b/lang/cem/cpp.ansi/ch3mon.h
@@ -0,0 +1,15 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef CH3MON_H_
+#define CH3MON_H_
+
+#include "arith.h"
+
+void ch3mon(int oper, register arith *pval, int *puns);
+
+#endif /* CH3MON_H_ */
diff --git a/lang/cem/cpp.ansi/domacro.h b/lang/cem/cpp.ansi/domacro.h
new file mode 100644
index 000000000..7bdc7a465
--- /dev/null
+++ b/lang/cem/cpp.ansi/domacro.h
@@ -0,0 +1,27 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef DOMACRO_H_
+#define DOMACRO_H_
+
+struct idf;
+
+void macro_def(register struct idf* id, char* text, int nformals, int length, int flags);
+void do_undef(char* argstr);
+/*	Control line interpreter. The '#' has already
+    been read by the lexical analyzer by which this function is called.
+    The token appearing directly after the '#' is obtained by calling
+    the basic lexical analyzing function GetToken() and is interpreted
+    to perform the action belonging to that token.
+    An error message is produced when the token is not recognized.
+    Pragma's are handled by do_pragma(). They are passed on to the
+    compiler.
+*/
+void domacro(void);
+char* GetIdentifier(int skiponerr);
+
+#endif /* DOMACRO_H_ */
diff --git a/lang/cem/cpp.ansi/error.h b/lang/cem/cpp.ansi/error.h
new file mode 100644
index 000000000..4a8275274
--- /dev/null
+++ b/lang/cem/cpp.ansi/error.h
@@ -0,0 +1,42 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef ERROR_H_
+#define ERROR_H_
+
+#if __STDC__
+/*VARARGS*/
+void error(char *fmt, ...);
+/*VARARGS*/
+void warning(char *fmt, ...);
+/*VARARGS*/
+void strict(char *fmt, ...);
+/*VARARGS*/
+void crash(char *fmt, ...);
+/*VARARGS*/
+void fatal(char *fmt, ...);
+#else
+/*VARARGS*/
+void error(va_alist);
+	va_dcl
+
+/*VARARGS*/
+void warning(va_alist);
+	va_dcl
+
+/*VARARGS*/
+void strict(va_alist);
+	va_dcl
+/*VARARGS*/
+void crash(va_alist);
+	va_dcl
+/*VARARGS*/
+void fatal(va_alist);
+	va_dcl
+#endif
+
+#endif /* ERROR_H_ */
diff --git a/lang/cem/cpp.ansi/expr.h b/lang/cem/cpp.ansi/expr.h
new file mode 100644
index 000000000..b4c7d9b75
--- /dev/null
+++ b/lang/cem/cpp.ansi/expr.h
@@ -0,0 +1,14 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef EXPR_H_
+#define EXPR_H_
+
+/*	The rank of the operator oper is returned. */
+int rank_of(int oper);
+
+#endif /* EXPR_H_ */
diff --git a/lang/cem/cpp.ansi/init.h b/lang/cem/cpp.ansi/init.h
new file mode 100644
index 000000000..134c9d34e
--- /dev/null
+++ b/lang/cem/cpp.ansi/init.h
@@ -0,0 +1,13 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef INIT_H_
+#define INIT_H_
+
+void init_pp(void);
+
+#endif /* INIT_H_ */
diff --git a/lang/cem/cpp.ansi/options.h b/lang/cem/cpp.ansi/options.h
new file mode 100644
index 000000000..4149da026
--- /dev/null
+++ b/lang/cem/cpp.ansi/options.h
@@ -0,0 +1,13 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef OPTIONS_H_
+#define OPTIONS_H_
+
+void do_option(char *text);
+
+#endif /* OPTIONS_H_ */
diff --git a/lang/cem/cpp.ansi/preprocess.h b/lang/cem/cpp.ansi/preprocess.h
new file mode 100644
index 000000000..97dea03b3
--- /dev/null
+++ b/lang/cem/cpp.ansi/preprocess.h
@@ -0,0 +1,14 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef PREPROCESS_H_
+#define PREPROCESS_H_
+
+void do_pragma(void);
+void preprocess(char *fn);
+
+#endif /* PREPROCESS_H_ */
diff --git a/lang/cem/cpp.ansi/skip.h b/lang/cem/cpp.ansi/skip.h
new file mode 100644
index 000000000..d32a7be96
--- /dev/null
+++ b/lang/cem/cpp.ansi/skip.h
@@ -0,0 +1,18 @@
+/*  Copyright (c) 2019 ACK Project.
+ *  See the copyright notice in the ACK home directory, 
+ *  in the file "Copyright".
+ *
+ *  Created on: 2019-02-09
+ *  
+ */
+#ifndef SKIP_H_
+#define SKIP_H_
+
+int SkipToNewLine(void);
+/*	Skips skips any white space and returns the first
+	non-space character.
+ */
+int skipspaces(register int ch, int skipnl);
+
+
+#endif /* SKIP_H_ */