add pkgsrc hooks for building pkgs w/nbsd_libc

Add two makefiles to manage compiling packages with NetBSD libc.

  *  minix.libc.mk contains the proper CFLAGS/LDFLAGS
  *  pkgsrchooks.mk contains the logic for setting the flags.
  *  update bmake

Several pkg-config files were added to help pkgsrc learn about
the c, minlib, and compat_minix libraries.

share/mk/Makefile

@@ -5,10 +5,10 @@ NOOBJ=	# defined
 .if ${MKSHARE} != "no"
 FILES=	bsd.ack.mk bsd.dep.mk bsd.files.mk \
 	bsd.gcc.mk bsd.inc.mk \
-	bsd.init.mk bsd.kinc.mk bsd.klinks.mk \
-	bsd.lib.mk bsd.links.mk bsd.man.mk bsd.obj.mk bsd.own.mk \
+	bsd.init.mk bsd.kinc.mk bsd.klinks.mk bsd.lib.mk \
+	bsd.links.mk bsd.man.mk bsd.obj.mk bsd.own.mk \
 	bsd.prog.mk bsd.subdir.mk bsd.sys.mk bsd.gcov.mk \
-	sys.mk
+	minix.libc.mk pkgsrchooks.mk sys.mk
 
 # MINIX-specific files
 FILES+= minix.bootprog.mk

share/mk/minix.libc.mk

@@ -0,0 +1,7 @@
+# NetBSD libc flags go here
+NETBSD_LIBC_CPPFLAGS=-nostdinc -D__NBSD_LIBC -isystem /usr/netbsd/include
+NETBSD_LIBC_LDFLAGS=-nostdlib /usr/netbsd/lib/crt1.o /usr/netbsd/lib/crti.o /usr/netbsd/lib/crtn.o -L/usr/netbsd/lib -lc -L/usr/pkg/lib -lgcc -L/usr/netbsd/lib -lminlib -lcompat_minix
+
+# Minix libc flags go here
+MINIX_LIBC_CPPFLAGS=
+MINIX_LIBC_LDFLAGS=

share/mk/pkgsrchooks.mk

@@ -0,0 +1,36 @@
+#
+
+.if !defined(_MINIX_PKGSRC_HOOKS_)
+_MINIX_PKGSRC_HOOKS_=1
+
+# Get PKGS_REQUIRING_MINIX_LIBC
+.include "/usr/pkgsrc/minix/pkgs_requiring_minix_libc.mk"
+
+# Get MINIX_LIBC_* and NETBSD_LIBC_*
+.include "/usr/share/mk/minix.libc.mk"
+
+# Build everything not in PKGS_REQUIRING_MINIX_LIBC with NetBSD libc
+PKG_REQUIRES_MINIX_LIBC=no
+
+# Search PKGS_REQUIRING_MINIX_LIBC to see if it needs Minix libc
+.for PKG_REQUIRING_MINIX_LIBC in ${PKGS_REQUIRING_MINIX_LIBC}
+.if "${PKG_REQUIRING_MINIX_LIBC}" == "${CATEGORIES}/${PKGBASE}"
+PKG_REQUIRES_MINIX_LIBC=yes
+.endif
+.endfor
+
+# Set the proper compilation flags
+.if ${PKG_REQUIRES_MINIX_LIBC} == yes
+CPPFLAGS+=	${MINIX_LIBC_CPPFLAGS}
+LDFLAGS+=	${MINIX_LIBC_LDFLAGS}
+.else
+SED=/bin/sed
+.include "/usr/pkgsrc/mk/nbsd_libc.buildlink3.mk"
+PREFER_NATIVE+=minlib
+PREFER_NATIVE+=compat_minix
+PREFER_NATIVE+=nbsd_libc
+CPPFLAGS+=	${NETBSD_LIBC_CPPFLAGS}
+LDFLAGS+=	${NETBSD_LIBC_LDFLAGS}
+.endif
+
+.endif  # !defined(_MINIX_PKGSRC_HOOKS_)