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Move PREFIX to config.mk

This prefix needs to be the same for all the toolchain.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -1,9 +1,6 @@

 #define INPUTSIZ LINESIZ

-#ifndef PREFIX

-#define PREFIX "/usr/"

-#endif

 #define GLOBALCTX 0

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -11,10 +11,6 @@

 #include "arch.h"

 #include "cc1.h"

-#ifndef PREFIX

-#define PREFIX "/usr/include/local"

-#endif

-

 static char *argp, *macroname;

 static unsigned arglen;

 static Symbol *symline, *symfile;

--- a/config.mk

+++ b/config.mk

@@ -8,10 +8,11 @@

 PREFIX    = /usr/local/

 MANPREFIX = ${PREFIX}/share/man

-CC = cc

+# if your system is not POSIX maybe you want to use cc or gcc

+CC = c99

 LD = $(CC)

 AR = ar

 # for Plan9 add -D_SUSV2_SOURCE -DNBOOL

-CFLAGS   = -DNDEBUG -Iarch/$(ARCH) -O2 -std=c99

+CFLAGS   = -DNDEBUG -Iarch/$(ARCH) -DPREFIX=\""$(PREFIX)"\"

 LDFLAGS  = -s

--- a/inc/cc.h

+++ b/inc/cc.h

@@ -16,6 +16,10 @@

 #define DBGON()

 #endif

+#ifndef PREFIX

+#define PREFIX "/usr/local/"

+#endif

+

 extern void die(const char *fmt, ...);

 extern void dbg(const char *fmt, ...);

 extern void *xmalloc(size_t size);