NetBSD support. Thanks to Christoph Lohmann.

src/libthread/mkfile

@@ -24,7 +24,9 @@ tspawnloop: tspawnloop.$O
 	9l -o $target $target.$O $PLAN9/lib/$LIB -l9 -lpthread
 
 %.$O: %.c
-	9c -I. $stem.c
+	$CC -I. $stem.c
+
+NetBSD.$O: Linux.c
 
 test:V: tprimes tspawn
 	primes 1 10007 >p1.txt

src/libthread/sysofiles.sh

@@ -17,6 +17,9 @@ case "$tag" in
 *-FreeBSD-*)
 	echo $SYSNAME.o ${SYSNAME}asm.o
 	;;
+*-NetBSD-*)
+	echo $SYSNAME.o ${SYSNAME}asm.o
+	;;
 *-Darwin-*)
 	echo ${SYSNAME}-${OBJTYPE}-asm.o ${SYSNAME}-${OBJTYPE}.o pthread.o
 	;;