--- boost1.36-1.36.0.orig/tools/jam/src/jam.h
+++ boost1.36-1.36.0/tools/jam/src/jam.h
@@ -418,6 +418,10 @@
 # include <stdlib.h>
 # endif
 
+# ifdef __GLIBC__
+# include <unistd.h>
+# endif
+
 # if !defined(OS_BSDI) && \
      !defined(OS_FREEBSD) && \
      !defined(OS_DRAGONFLYBSD) && \