Syntax Error: invalid syntax in SConstruct file

[Sagovind]

when building the library version 0.8.2 using scons, observed a compilation error.

"File "/home/sarath/TESTMP/MaintenancePortal/Distribution/scripts/.libs/websocketpp-0.8.2/SConstruct", line 35
raise SCons.Errors.UserError, "Neither BOOST_ROOT, nor BOOST_INCLUDES + BOOST_LIBS was set!"
SyntaxError: invalid syntax "

due to which it stopped building.

I have used below script for building

INSTALLLOCATION=~/testing
BOOST_VERSION=boost_1_52_0

if [[ ! -d ${INSTALLLOCATION}/websocketpp-0.8.2 ]]; then
tar -C ${INSTALLLOCATION} -xzf ~/websocketpp-0.8.2.tar.gz
cd ${INSTALLLOCATION}/websocketpp-0.8.2
make clean
BOOST_INCLUDES=pwd/../${BOOST_VERSION} BOOST_LIBS=pwd/../${BOOST_VERSION}/stage/lib/ scons
cd -
else
echo websocketpp has already built.
fi

scons version used
SCons: v4.9.0.99a8c86de1ce91d23b102520e185c54ebd968924

python version used
Python 3.9.21