diff --git a/srcpkgs/rc/patches/va_copy.patch b/srcpkgs/rc/patches/va_copy.patch
new file mode 100644
index 0000000000..058a4afb95
--- /dev/null
+++ b/srcpkgs/rc/patches/va_copy.patch
@@ -0,0 +1,61 @@
+--- print.c
++++ print.c
+@@ -285,11 +285,11 @@ extern int fmtprint(Format *format, const char *fmt,...) {
+ 	va_list ap, saveargs;
+ 
+ 	va_start(ap, fmt);
+-	__va_copy(saveargs, format->args);
+-	__va_copy(format->args, ap);
++	va_copy(saveargs, format->args);
++	va_copy(format->args, ap);
+ 	n += printfmt(format, fmt);
+ 	va_end(format->args);
+-	__va_copy(format->args, saveargs);
++	va_copy(format->args, saveargs);
+ 
+ 	return n + format->flushed;
+ }
+@@ -316,7 +316,7 @@ extern int fprint(int fd, const char *fmt,...) {
+ 	format.u.n	= fd;
+ 
+ 	va_start(ap, fmt);
+-	__va_copy(format.args, ap);
++	va_copy(format.args, ap);
+ 	printfmt(&format, fmt);
+ 	va_end(format.args);
+ 
+@@ -361,7 +361,7 @@ extern char *mprint(const char *fmt,...) {
+ 
+ 	format.u.n = 1;
+ 	va_start(ap, fmt);
+-	__va_copy(format.args, ap);
++	va_copy(format.args, ap);
+ 	result = memprint(&format, fmt, ealloc(PRINT_ALLOCSIZE), PRINT_ALLOCSIZE);
+ 	va_end(format.args);
+ 	return result;
+@@ -374,7 +374,7 @@ extern char *nprint(const char *fmt,...) {
+ 
+ 	format.u.n = 0;
+ 	va_start(ap, fmt);
+-	__va_copy(format.args, ap);
++	va_copy(format.args, ap);
+ 	result = memprint(&format, fmt, nalloc(PRINT_ALLOCSIZE), PRINT_ALLOCSIZE);
+ 	va_end(format.args);
+ 	return result;
+--- proto.h
++++ proto.h
+@@ -23,11 +23,11 @@ typedef long align_t;
+ 
+ #include <stdarg.h>
+ 
+-/* C 9x specifies a __va_copy() macro which should be used for copying
++/* C 9x specifies a va_copy() macro which should be used for copying
+ objects of type va_list.  Of course, most places don't have this yet,
+ but where it does exist we need to use it. */
+-#ifndef __va_copy
+-#define __va_copy(x,y) (x)=(y)
++#ifndef va_copy
++#define va_copy(x,y) (x)=(y)
+ #endif
+ 
+ #if STDC_HEADERS