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Add total compability to the Makefiles

With .POSIX target we get that the user
without environment will execute c99. If the user
has no c99, then it can source env.sh or execute
build.sh.

--- a/Makefile

+++ b/Makefile

@@ -6,3 +6,5 @@

 	do \

 		(cd $$i && $(MAKE) $@) ;\

 	done

+

+.POSIX:

--- a/build.sh

+++ b/build.sh

@@ -1,11 +1,5 @@

 #!/bin/sh

-case `uname` in

-Plan9)

-	CFLAGS="-D_SUSV2_SOURCE -DNBOOL"

-	export CFLAGS

-	;;

-esac

-

+source env.sh

 make $@

--- a/cc1/Makefile

+++ b/cc1/Makefile

@@ -1,8 +1,9 @@

-CFLAGS = -ansi

 OBJS = types.o decl.o lex.o error.o symbol.o main.o expr.o \

 	code.o stmt.o cpp.o

 all: cc1

+

+.POSIX:

 $(OBJS) : cc1.h ../inc/cc.h ../inc/sizes.h

--- a/cc2/Makefile

+++ b/cc2/Makefile

@@ -5,6 +5,8 @@

 all: cc2

+.POSIX:

+

 $(OBJS): ../inc/cc.h ../inc/sizes.h cc2.h

 main.o: error.h

--- /dev/null

+++ b/env.sh

@@ -1,0 +1,23 @@

+#!/bin/sh

+

+case `uname` in

+Plan9)

+	CFLAGS="-D_SUSV2_SOURCE -DNBOOL"

+	export CFLAGS

+	;;

+*)

+	case x$CC in

+	xc99)

+		;;

+	x|xgcc)

+		CC=gcc

+		CFLAGS=-std=c99

+		export CFLAGS CC

+		;;

+	*)

+		echo You need a c99 compiler for this program 2>&1

+		exit

+		;;

+	esac

+	;;

+esac

--- a/lib/Makefile

+++ b/lib/Makefile

@@ -3,6 +3,8 @@

 all: libcc.a

+.POSIX:

+

 libcc.a: $(OBJS)

 	ar r $@ $?