I've installed libbsd(I think I have successed because when I execute man heapsort I see this) and I make a link /lib/libbsd.so since in the file Make.defines.linux the LDDIR is as follows: then I add this to threads/barrier.c howerver, I still get this: ? 2014/7/29 23:58, Jonathan Billings ??: > On Tue, Jul 29, 2014 at 10:00:53PM +0800, Theodore Si wrote: >> Hi all, >> >> I want to compile the source code of Advanced Programming in the Unix >> Environment(APUE) 3rd edition, and I encountered some difficulties. >> After executing "make", I got this message: >> [...] >> How to install libbsd to solve this problem on CentOS (this works on >> Ubuntu)? > You need the 'libbsd' package, available in EPEL. > (http://fedoraproject.org/wiki/EPEL) > > The 'heapsort()' function is implemented there. >