diff --git a/include/msvcrt/conio.h b/include/msvcrt/conio.h
index 7082b42096..296f28a48a 100644
--- a/include/msvcrt/conio.h
+++ b/include/msvcrt/conio.h
@@ -40,9 +40,7 @@ unsigned short _outpw(unsigned short, unsigned short);
 
 #ifndef USE_MSVCRT_PREFIX
 static inline char* cgets(char* str) { return _cgets(str); }
-#define cprintf _cprintf
 static inline int cputs(const char* str) { return _cputs(str); }
-#define cscanf _cscanf
 static inline int getch(void) { return _getch(); }
 static inline int getche(void) { return _getche(); }
 static inline int kbhit(void) { return _kbhit(); }
@@ -54,6 +52,15 @@ static inline unsigned short inpw(unsigned short i) { return _inpw(i); }
 static inline int outp(unsigned short i, int j) { return _outp(i, j); }
 static inline unsigned short outpw(unsigned short i, unsigned short j) { return _outpw(i, j); }
 #endif
+
+#ifdef __GNUC__
+extern int cprintf(const char*,...) __attribute__((alias("_cprintf"),format(printf,1,2)));
+extern int cscanf(const char*,...) __attribute__((alias("_cscanf"),format(scanf,1,2)));
+#else
+#define cprintf _cprintf
+#define cscanf _cscanf
+#endif /* __GNUC__ */
+
 #endif /* USE_MSVCRT_PREFIX */
 
 #endif /* __WINE_CONIO_H */
diff --git a/include/msvcrt/io.h b/include/msvcrt/io.h
index 6b4787880b..efc23b5f9c 100644
--- a/include/msvcrt/io.h
+++ b/include/msvcrt/io.h
@@ -169,10 +169,8 @@ static inline int isatty(int fd) { return _isatty(fd); }
 static inline int locking(int fd, int mode, long size) { return _locking(fd, mode, size); }
 static inline long lseek(int fd, long off, int where) { return _lseek(fd, off, where); }
 static inline char* mktemp(char* pat) { return _mktemp(pat); }
-#define open _open
 static inline int read(int fd, void* buf, unsigned int size) { return _read(fd, buf, size); }
 static inline int setmode(int fd, int mode) { return _setmode(fd, mode); }
-#define sopen _sopen
 static inline long tell(int fd) { return _tell(fd); }
 #ifndef MSVCRT_UMASK_DEFINED
 static inline int umask(int fd) { return _umask(fd); }
@@ -183,6 +181,15 @@ static inline int unlink(const char* path) { return _unlink(path); }
 #define MSVCRT_UNLINK_DEFINED
 #endif
 static inline int write(int fd, const void* buf, unsigned int size) { return _write(fd, buf, size); }
+
+#ifdef __GNUC__
+extern int open(const char*,int,...) __attribute__((alias("_open")));
+extern int sopen(const char*,int,int,...) __attribute__((alias("_sopen")));
+#else
+#define open _open
+#define sopen _sopen
+#endif /* __GNUC__ */
+
 #endif /* USE _MSVCRT_PREFIX */
 
 #endif /* __WINE_IO_H */
diff --git a/include/msvcrt/process.h b/include/msvcrt/process.h
index adf69094b1..e4bc770c04 100644
--- a/include/msvcrt/process.h
+++ b/include/msvcrt/process.h
@@ -123,22 +123,35 @@ int         _wsystem(const MSVCRT(wchar_t)*);
 
 static inline int cwait(int *status, int pid, int action) { return _cwait(status, pid, action); }
 static inline int getpid(void) { return _getpid(); }
-#define execl    _execl
-#define execle   _execle
-#define execlp   _execlp
-#define execlpe  _execlpe
 static inline int execv(const char* name, char* const* argv) { return _execv(name, argv); }
 static inline int execve(const char* name, char* const* argv, const char* const* envv) { return _execve(name, argv, envv); }
 static inline int execvp(const char* name, char* const* argv) { return _execvp(name, argv); }
 static inline int execvpe(const char* name, char* const* argv, const char* const* envv) { return _execvpe(name, argv, envv); }
-#define spawnl   _spawnl
-#define spawnle  _spawnle
-#define spawnlp  _spawnlp
-#define spawnlpe _spawnlpe
 static inline int spawnv(int flags, const char* name, const char* const* argv) { return _spawnv(flags, name, argv); }
 static inline int spawnve(int flags, const char* name, const char* const* argv, const char* const* envv) { return _spawnve(flags, name, argv, envv); }
 static inline int spawnvp(int flags, const char* name, const char* const* argv) { return _spawnvp(flags, name, argv); }
 static inline int spawnvpe(int flags, const char* name, const char* const* argv, const char* const* envv) { return _spawnvpe(flags, name, argv, envv); }
+
+#ifdef __GNUC__
+extern int execl(const char*,const char*,...) __attribute__((alias("_execl")));
+extern int execle(const char*,const char*,...) __attribute__((alias("_execle")));
+extern int execlp(const char*,const char*,...) __attribute__((alias("_execlp")));
+extern int execlpe(const char*,const char*,...) __attribute__((alias("_execlpe")));
+extern int spawnl(int,const char*,const char*,...) __attribute__((alias("_spawnl")));
+extern int spawnle(int,const char*,const char*,...) __attribute__((alias("_spawnle")));
+extern int spawnlp(int,const char*,const char*,...) __attribute__((alias("_spawnlp")));
+extern int spawnlpe(int,const char*,const char*,...) __attribute__((alias("_spawnlpe")));
+#else
+#define execl    _execl
+#define execle   _execle
+#define execlp   _execlp
+#define execlpe  _execlpe
+#define spawnl   _spawnl
+#define spawnle  _spawnle
+#define spawnlp  _spawnlp
+#define spawnlpe _spawnlpe
+#endif  /* __GNUC__ */
+
 #endif /* USE_MSVCRT_PREFIX */
 
 #endif /* __WINE_PROCESS_H */
diff --git a/include/msvcrt/stdio.h b/include/msvcrt/stdio.h
index df0f169a1f..2ad6d9ef85 100644
--- a/include/msvcrt/stdio.h
+++ b/include/msvcrt/stdio.h
@@ -272,7 +272,7 @@ static inline MSVCRT(wint_t) fgetwchar(void) { return _fgetwchar(); }
 static inline MSVCRT(wint_t) fputwchar(MSVCRT(wint_t) wc) { return _fputwchar(wc); }
 static inline int getw(MSVCRT(FILE)* file) { return _getw(file); }
 static inline int putw(int val, MSVCRT(FILE)* file) { return _putw(val, file); }
-#define wpopen   _wpopen
+static inline MSVCRT(FILE)* wpopen(const MSVCRT(wchar_t)* command,const MSVCRT(wchar_t)* mode) { return _wpopen(command, mode); }
 #endif /* USE_MSVCRT_PREFIX */
 
 #endif /* __WINE_STDIO_H */