--- kBuild-0.1.9998-pre20110817/src/kash/Makefile.kmk
+++ kBuild-0.1.9998-pre20110817/src/kash/Makefile.kmk
@@ -59,6 +59,7 @@
 if "$(USER)" == "bird" && "$(KBUILD_TARGET)" != "win"
 kash_CFLAGS += -std=gnu99
 endif
+kash_LIBS += pthread
 kash_CFLAGS.win.amd64 = -GS-
 kash_SOURCES = \
 	main.c \