g++: Command not found on Linux RHEL_7_4 (gcc-x86_64)

QtCore: created fwd-include header(s) for <srcbase>/src/corelib/xml/ { qxmlstream.h (1), qxmlstream_p.h (1), qxmlutils_p.h (1) }
Creating qmake...
g++ -c -o main.o   -std=c++11 -ffunction-sections -g -g  -I/home/qt/work/qt/qtbase/qmake -I/home/qt/work/qt/qtbase/qmake/library -I/home/qt/work/qt/qtbase/qmake/generators -I/home/qt/work/qt/qtbase/qmake/generators/unix -I/home/qt/work/qt/qtbase/qmake/generators/win32 -I/home/qt/work/qt/qtbase/qmake/generators/mac -I../include -I../include/QtCore -I../include/QtCore/5.11.0 -I../include/QtCore/5.11.0/QtCore -I../src/corelib/global -I/home/qt/work/qt/qtbase/mkspecs/linux-g++ -DQT_VERSION_STR=\"5.11.0\" -DQT_VERSION_MAJOR=5 -DQT_VERSION_MINOR=11 -DQT_VERSION_PATCH=0 -DQT_BUILD_QMAKE -DQT_BOOTSTRAPPED -DPROEVALUATOR_FULL -DQT_NO_FOREACH /home/qt/work/qt/qtbase/qmake/main.cpp
gmake: g++: Command not found
gmake: *** [main.o] Error 127

agent:2017/12/19 17:58:43 build.go:203: Process finished with error: exit status 2
agent:2017/12/19 17:58:43 build.go:408: Executing scheduled instruction 1 of 1 - Upload all core dumps if there are some
agent:2017/12/19 17:58:43 build.go:410: 
agent:2017/12/19 17:58:43 build.go:155: Error reading from stdout/err: exit status 2
agent:2017/12/19 17:58:43 agent.go:181: Build failed
agent:2017/12/19 17:58:43 agent.go:79: ERROR building: exit status 2