SOAPdenovo下载源码安装，make后发现编译错误：

collect2: error: ld returned 1 exit status

make: *** [SOAPdenovo-63mer] Error 1

仔细查看编译输出，发现有如下几个错误提示：

multi_threads.cpp:93:14: error: ‘usleep’ was not declared in this scope

build_preArc.cpp:1071:39: error: ‘usleep’ was not declared in this scope

pregraph_sparse.cpp:171:42: error: ‘usleep’ was not declared in this scope

pregraph_sparse.cpp:504:2: error: ‘optind’ was not declared in this scope

pregraph_sparse.cpp:507:64: error: ‘getopt’ was not declared in this scope

于是找到这些源码，在头文件中加入：

#include “unistd.h“

问题解决！