diff --git a/lang/pc/libpc/pc.h b/lang/pc/libpc/pc.h
index 3590b25a0..b3f533eab 100644
--- a/lang/pc/libpc/pc.h
+++ b/lang/pc/libpc/pc.h
@@ -5,14 +5,98 @@
 #include "pc_file.h"
 #include "pc_math.h"
 
+extern char *_ecvt(double value, int ndigit, int *decpt, int *sign);
+extern char *_fcvt(double value, int ndigit, int *decpt, int *sign);
+extern char *_wdw(struct file *f);
+extern char *argv(int i);
+extern char *environ(int i);
+extern char *strbuf(char *s);
+extern double _abr(double r);
+extern double _atn(double x);
+extern double _cos(double x);
+extern double _exp(double x);
+extern double _log(double x);
+extern double _rdr(struct file *f);
+extern double _rnd(double r);
+extern double _sin(double x);
+extern double _sqt(double x);
+extern int _abi(int i);
+extern int _ass(int line, int bool);
+extern int _asz(struct descr *dp);
+extern int _bcp(int sz, unsigned char *y, unsigned char *x);
+extern int _catch(unsigned erno);
+extern int _cls(struct file *f);
+extern int _cre(int sz, struct file *f);
+extern int _dvi(unsigned int j, unsigned int i);
+extern int _efl(struct file *f);
+extern int _eln(struct file *f);
+extern int _flush(struct file *f);
+extern int _fstdig(struct file *f);
+extern int _get(struct file *f);
+extern int _getint(struct file *f);
+extern int _getsig(struct file *f);
+extern int _hlt(int ecode);
+extern int _incpt(struct file *f);
+extern int _ini(char *args, int c, struct file **p, char *mainlb);
+extern int _mdi(int j, int i);
+extern int _nfa(int bool);
+extern int _nxtdig(struct file *f);
+extern int _opn(int sz, struct file *f);
+extern int _outcpt(struct file *f);
+extern int _pac(struct descr *ad, struct descr *zd, char *zp, int i, char *ap);
+extern int _pag(struct file *f);
+extern int _put(struct file *f);
+extern int _rcka(struct array_descr *descr, int index);
+extern int _rdc(struct file *f);
+extern int _rdi(struct file *f);
+extern int _rf(struct file *f);
+extern int _rln(struct file *f);
+extern int _skipsp(struct file *f);
+extern int _unp(struct descr *ad, struct descr *zd, int i, char *ap, char *zp, int noext);
+extern int _wf(struct file *f);
+extern int _wln(struct file *f);
+extern int _wrc(int c, struct file *f);
+extern int _wrf(int n, int w, double r, struct file *f);
+extern int _wri(int i, struct file *f);
+extern int _wrl(long l, struct file *f);
+extern int _wrr(double r, struct file *f);
+extern int _wsl(int w, long l, struct file *f);
+extern int _wsr(int w, double r, struct file *f);
+extern int _xcls(struct file *f);
+extern int argc(void);
+extern int argshift(void);
+extern int buff(struct file *f);
+extern int clock(void);
+extern int diag(struct file *f);
+extern int nobuff(struct file *f);
+extern int notext(struct file *f);
+extern int pclose(struct file *f);
+extern int pcreat(struct file *f, char *s);
+extern int perrno(void);
+extern int popen(struct file *f, char *s);
+extern int procentry(char *name);
+extern int procexit(char *name);
+extern int strfetch(char *s, int i);
+extern int strlen(char *s);
+extern int strstore(char *s, int i, int c);
+extern int strtobuf(char *s, char *b, int l);
+extern int uread(int fd, char *b, int n);
+extern int uwrite(int fd, char *b, int n);
+extern long _abl(long i);
+extern long _dvil(unsigned long j, unsigned long i);
+extern long _mdil(long j, long i);
+extern long _mdl(long j, long i);
+extern long _rdl(struct file *f);
+extern void _dis(int n, void **ptr);
+extern void _new(int n, void **ptr);
 extern void _trp(int trapno);
-extern void _wrb(int b, struct file* f);
-extern void _wrs(int len, char* s, struct file* f);
-extern void _wrz(char* s, struct file* f);
+extern void _wrb(int b, struct file *f);
+extern void _wrs(int len, char *s, struct file *f);
+extern void _wrz(char *s, struct file *f);
 extern void _wsb(int w, int b, struct file* f);
 extern void _wsc(int w, char c, struct file* f);
 extern void _wss(int w, int len, char* s, struct file* f);
 extern void _wstrin(int width, int len, char* buf, struct file* f);
 extern void _wsz(int w, char* s, struct file* f);
 
-#endif
+#endif