Compiling the TRACKRT on Centos7

[Zzh@zhaozhonghai trackrt]$ make
g++-c-pipe-o2-wall-w-d_reentrant-dqt_no_debug-dqt_gui_lib-dqt_network_lib-dqt_core_lib-dqt_shared \
-i/usr/local/trolltech/qt-4.8.5/include/mkspecs/linux-g++-i/usr/local/trolltech/qt-4.8.5/include/qtcore-i/usr/ Local/trolltech/qt-4.8.5/include/qtnetwork-i/usr/local/trolltech/qt-4.8.5/include-c TrackRTCommB.cpp
trackRTCommB.cpp:In function ' int main (int, char**) ':
Trackrtcommb.cpp:127:15:error: ' Sleep ' is not declared in this scope
Sleep (1);
^
Trackrtcommb.cpp:170:17:error: ' Sleep ' is not declared in this scope
Sleep (1);
^
trackRTCommB.cpp:In function ' void trt_comline (int, char**, int*, char*, char*, char*, char*, int*, char*) ':
trackrtcommb.cpp:312:28:warning:converting to Non-pointer type ' char ' from NULL [-wconversion-null]
PRCSITE[INDX] = NULL; Null terminate the list
^
Make: * * * [TRACKRTB] Error 1
[Zzh@zhaozhonghai trackrt]$

[Zzh@zhaozhonghai trackrt]$ make
g++-c-pipe-o2-wall-w-d_reentrant-dqt_no_debug-dqt_gui_lib-dqt_network_lib-dqt_core_lib-dqt_shared \
-i/usr/local/trolltech/qt-4.8.5/include/mkspecs/linux-g++-i/usr/local/trolltech/qt-4.8.5/include/qtcore-i/usr/ Local/trolltech/qt-4.8.5/include/qtnetwork-i/usr/local/trolltech/qt-4.8.5/include-c TrackRTCommB.cpp
trackRTCommB.cpp:In function ' void trt_comline (int, char**, int*, char*, char*, char*, char*, int*, char*) ':
trackrtcommb.cpp:314:28:warning:converting to Non-pointer type ' char ' from NULL [-wconversion-null]
PRCSITE[INDX] = NULL; Null terminate the list
^
Gfortran-o3-wuninitialized-fno-f2c-ffast-math-fno-automatic-fno-backslash trackrtcommb.o-l/usr/local/lib-l/usr/ Local/trolltech/qt-4.8.5/lib-lqtnetwork-lqtcore-lpthread-lstdc++./trackrt_lib.a. /GEN_UTIL/GEN_UTIL_LIB.A. /.. /LIBRARIES/MATRIX/KINV_LIB.A. /.. /libraries/comlib/com_lib.a-o TRACKRTB
Rm-f TRACKRTCOMMB.O
g++-c-pipe-o2-wall-w-d_reentrant-dqt_no_debug-dqt_gui_lib-dqt_network_lib-dqt_core_lib-dqt_shared \
-i/usr/local/trolltech/qt-4.8.5/include/mkspecs/linux-g++-i/usr/local/trolltech/qt-4.8.5/include/qtcore-i/usr/ Local/trolltech/qt-4.8.5/include/qtnetwork-i/usr/local/trolltech/qt-4.8.5/include-c Test_trackRT.cpp
Gfortran-o3-wuninitialized-fno-f2c-ffast-math-fno-automatic-fno-backslash test_trackrt.o-l/usr/local/lib-l/usr/ Local/trolltech/qt-4.8.5/lib-lqtnetwork-lqtcore-lpthread-lstdc++./trackrt_lib.a. /GEN_UTIL/GEN_UTIL_LIB.A. /.. /LIBRARIES/MATRIX/KINV_LIB.A. /.. /libraries/comlib/com_lib.a-o TEST_TRACKRT
Rm-f TEST_TRACKRT.O
[Zzh@zhaozhonghai trackrt]$

------------------------------------------------

Error occurred: Sleep (1) was not found, function, added in this CPP source file

#include <unistd.h>

Be resolved.