Pregenerate the parser (gram.c) and disable implicit regeneration.

Drop yacc(1) dependency.
This solves the circular dependency f2c->bison->libiconv->libtool-base->f2c

lang/f2c/Makefile

@@ -1,7 +1,7 @@
-# $NetBSD: Makefile,v 1.52 2009/12/28 11:42:19 tnn Exp $
+# $NetBSD: Makefile,v 1.53 2010/01/03 01:37:59 tnn Exp $
 
 DISTNAME=	f2c-20090411	# see notes below
-PKGREVISION=	3
+PKGREVISION=	4
 CATEGORIES=	lang
 MASTER_SITES=	${MASTER_SITE_LOCAL}
 
@@ -18,7 +18,6 @@ WRKSRC=		${WRKDIR}/f2c
 BUILD_DIRS=	src
 USE_BSD_MAKEFILE=	yes
 MAKE_ENV+=		MKCATPAGES=no
-USE_TOOLS+=		yacc
 INSTALLATION_DIRS=	bin share/doc/f2c ${PKGMANDIR}/man1
 
 .include "../../mk/bsd.prefs.mk"
@@ -33,6 +32,7 @@ F2C_F77_CPP=	${CPP}
 
 post-extract:
 	@${CP} ${FILESDIR:Q}/f2c.mk ${WRKSRC}/src/Makefile
+	@${CP} ${FILESDIR:Q}/gram.c ${WRKSRC}/src/gram.c
 	@mv ${WRKSRC}/src/.depend  ${WRKSRC}/src/depend.orig
 	@mv ${WRKSRC}/src/f2c.1 ${WRKSRC}/src/f2c.1.orig
 

lang/f2c/files/f2c.mk

@@ -1,7 +1,7 @@
 # Makefile for f2c, a Fortran 77 to C converter
 
 PROG=	f2c
-SRCS=	main.c init.c gram.y lex.c proc.c equiv.c data.c format.c \
+SRCS=	main.c init.c gram.c lex.c proc.c equiv.c data.c format.c \
 	expr.c exec.c intr.c io.c misc.c error.c mem.c names.c \
 	output.c p1output.c pread.c put.c putpcc.c vax.c formatdata.c \
 	parse_args.c niceprintf.c cds.c sysdep.c version.c $(MALLOC)
@@ -21,6 +21,7 @@ MALLOC=		# empty
 # (derived with a Unix variant of the yacc from plan9).
 
 # There should be 4 shift/reduce conflicts:
+.if make(gram.c)
 gram.y:	gram.head gram.dcl gram.expr gram.exec gram.io tokdefs.h
 	( sed "s/#define/%token/" < $(.ALLSRC:M*tokdefs.h) ; \
 		cat $(.ALLSRC:M*gram.head) \
@@ -29,6 +30,9 @@ gram.y:	gram.head gram.dcl gram.expr gram.exec gram.io tokdefs.h
 		    $(.ALLSRC:M*gram.exec) \
 		    $(.ALLSRC:M*gram.io) ) > $@
 CLEANFILES+=	gram.y
+.else
+gram.c:
+.endif
 
 DPADD=	defs.h ftypes.h defines.h machdefs.h sysdep.h