Use a build-tool to create the .mgc files.

Submitted by:	ru (partial)
Obtained from:	NetBSD (basic idea)
Reviewed by:	bde, ru

Makefile.inc1

@@ -600,7 +600,8 @@ _libkrb5= kerberos5/lib/libasn1 kerberos5/lib/libhdb kerberos5/lib/libsl
 
 build-tools:
 .for _tool in bin/csh bin/sh ${_games} gnu/usr.bin/cc/cc_tools ${_fortran} \
-    ${_libroken4} ${_libkrb5} lib/libncurses ${_share} usr.sbin/sysinstall
+    ${_libroken4} ${_libkrb5} lib/libncurses ${_share} usr.bin/file \
+    usr.sbin/sysinstall
 	cd ${.CURDIR}/${_tool}; ${MAKE} build-tools
 .endfor
 

usr.bin/file/Makefile

@@ -40,23 +40,29 @@ MAGFILES=	${SRCDIR}/Header\
 		${SRCDIR}/Localstuff\
 		${SRCDIR}/Magdir/[a-z]*
 
-all: file magic magic.mgc magic.mime.mgc
+all: ${PROG} magic.mgc magic.mime.mgc
 
 magic: ${MAGFILES}
 	cat ${.ALLSRC} > ${.TARGET}
 
-magic.mgc: file magic
-	./${PROG} -C -m magic
+magic.mgc: mkmagic magic
+	./mkmagic magic
 
-magic.mime.mgc: file magic.mime
+magic.mime.mgc: mkmagic magic.mime
 	ln -sf ${SRCDIR}/magic.mime magic.mime.PITA
-	./${PROG} -C -m magic.mime.PITA
+	./mkmagic magic.mime.PITA
 	mv magic.mime.PITA.mgc magic.mime.mgc
 
 CLEANFILES+=	print-hacked.c
 print-hacked.c: print.c
 	sed -e 's|daylight|0/*daylight*/|g' ${.ALLSRC} > ${.TARGET}
 
+CLEANFILES+=	mkmagic
+build-tools: mkmagic
+mkmagic: apprentice.c print-hacked.c
+	${CC} -DHAVE_CONFIG_H -DCOMPILE_ONLY \
+	    -I${.CURDIR} -I${SRCDIR} -o ${.TARGET} ${.ALLSRC}
+
 beforeinstall:
 	${INSTALL} ${COPY} -o ${BINOWN} -g ${BINGRP} -m ${MAGICMODE} \
 	    magic magic.mgc ${SRCDIR}/magic.mime magic.mime.mgc \